带有 viewpager 的 TabLayout 滚动不流畅
TabLayout with viewpager not smooth scrolling
编辑
我已经按照这些教程解决了这个问题。
http://www.truiton.com/2015/06/android-tabs-example-fragments-viewpager/
https://guides.codepath.com/android/google-play-style-tabs-using-tablayout
http://www.voidynullness.net/blog/2015/08/16/android-tablayout-design-support-library-tutorial/
但在尝试了多种解决方案后，问题仍然存在，这很烦人。这是问题的演示，我 facing.Its 已经好几周没被困在这个问题上了。
Link 用于演示。
我用于测试的设备是 Nexus 4 和 Nexus 5。
TabLayout 和 ViewPager 滚动不流畅。我需要滑动两次才能在下次点击时移动。我环顾了网络，但找不到任何解决方案。
我正在使用最新的支持设计库。
这里是 gradle 文件
apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion "23.0.3"
defaultConfig {
applicationId "com.softoven.ultron"
minSdkVersion 15
targetSdkVersion 23
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.3.0'
compile 'com.android.support:design:23.3.0'
compile 'org.jsoup:jsoup:1.6.1'
compile 'com.mikhaellopez:circularimageview:3.0.0'
compile 'com.android.support:recyclerview-v7:23.3.0'
compile 'com.mcxiaoke.volley:library:1.0.19'
compile 'com.nostra13.universalimageloader:universal-image-loader:1.9.5'
compile 'com.google.code.gson:gson:2.5'
}
这是Activity代码。
private DrawerLayout drawerLayout;
private ViewPager viewPager;
private TabLayout tabLayout;
private NavigationView navigationView;
private CategoriesDTO categoriesDTO;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initToolbar();
initUi();
loadCategories();
}
private void initToolbar() {
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeAsUpIndicator(R.drawable.ic_action_menu);
}
private void initUi() {
drawerLayout = (DrawerLayout) findViewById(R.id.drawer);
navigationView = (NavigationView) findViewById(R.id.navigation);
viewPager = (ViewPager) findViewById(R.id.viewPager);
tabLayout = (TabLayout) findViewById(R.id.tab);
}
private void loadCategories() {
StringRequest request = new StringRequest(Constants.URL_GET_CATEGORIES, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
categoriesDTO = Constants.gson.fromJson(response, CategoriesDTO.class);
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
viewPager.setOffscreenPageLimit(1);
viewPager.setAdapter(adapter);
setTabLayout();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
});
ApplicationController.getmInstance().addToRequestQueue(request);
}
private void setTabLayout() {
tabLayout.setupWithViewPager(viewPager);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.menu.home_side_menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
switch (id) {
case android.R.id.home:
drawerLayout.openDrawer(GravityCompat.START);
return true;
}
return super.onOptionsItemSelected(item);
}
private class ViewPagerAdapter extends FragmentPagerAdapter {
public ViewPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
return new ContentFragment();
}
@Override
public int getCount() {
return 10;
}
@Override
public CharSequence getPageTitle(int position) {
String title = categoriesDTO.getCategories().get(position).getTitle();
return (CharSequence) title;
}
}
和xml文件
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:id="@+id/app_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<include
android:id="@+id/toolbar"
layout="@layout/toolbar"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
<android.support.design.widget.TabLayout
android:id="@+id/tab"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabTextColor="#fff"
app:tabGravity="fill"
app:tabMode="scrollable"
>
</android.support.design.widget.TabLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="@+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
</android.support.v4.view.ViewPager>
</android.support.design.widget.CoordinatorLayout>
<android.support.design.widget.NavigationView
android:id="@+id/navigation"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
app:menu="@menu/home_drawer_menu">
</android.support.design.widget.NavigationView>
这是您可以看到指标被部分分割的屏幕截图。
有什么解决办法吗？
在您的 Android 清单文件 中将此行添加到 <Application> 标签
android:largeHeap="true"
在您的应用上启用所有 StrictMode 策略以检测您可能无意中在主线程上执行的任何冗长操作，从而导致延迟，以便您可以采取进一步的必要纠正措施。
StrictMode 是一种开发人员工具，可以检测您可能无意中做的事情并提醒您注意它们，以便您进行修复。 StrictMode 最常用于捕获应用程序主线程上的意外磁盘或网络访问，其中接收 UI 操作并发生动画。
详情请见https://developer.android.com/reference/android/os/StrictMode.html
// Enable all thread strict mode policies
StrictMode.ThreadPolicy.Builder threadPolicyBuilder = new StrictMode.ThreadPolicy.Builder();
// Detect everything that's potentially suspect
threadPolicyBuilder.detectAll();
// Crash the whole process on violation
threadPolicyBuilder.penaltyDeath();
// Log detected violations to the system log
threadPolicyBuilder.penaltyLog();
// Crash the whole process on any network usage.
threadPolicyBuilder.penaltyDeathOnNetwork();
StrictMode.ThreadPolicy threadPolicy = threadPolicyBuilder.build();
StrictMode.setThreadPolicy(threadPolicy);
// Enable all VM strict mode policies
StrictMode.VmPolicy.Builder vmPolicyBuilder = new StrictMode.VmPolicy.Builder();
// Detect everything that's potentially suspect
vmPolicyBuilder.detectAll();
// Log detected violations to the system log
vmPolicyBuilder.penaltyLog();
StrictMode.VmPolicy vmPolicy = vmPolicyBuilder.build();
StrictMode.setVmPolicy(vmPolicy);
I think you need to use override method setUserVisibleHint.
You need to add this in your Fragment.
@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
super.setUserVisibleHint(isVisibleToUser);
if (isVisibleToUser) {
// load data here
}else{
// fragment is no longer visible
}
}
Make your offScreenPageLimit to NUMBER OF TABS you have.
详细了解 setUserVisibleHint here。
这对于android的坐标布局和appBar布局来说并不是什么新鲜事；我敢肯定，无论您做什么，都无法使它变得更顺畅。
然而
https://github.com/henrytao-me/smooth-app-bar-layout
这可以满足您的要求；
但是首先从
下载示例应用程序
https://play.google.com/store/apps/details?id=me.henrytao.smoothappbarlayout
看看它是否符合您的需要。（只是为了确定）
首先，为了让一切顺利，不要在主线程上进行大量操作，使用异步任务（不要在异步任务中触摸视图），无论如何都会顺利:)
试试我的方法：
SlidingTabLayout:
public class SlidingTabLayout extends HorizontalScrollView {
/**
* Allows complete control over the colors drawn in the tab layout. Set with
* {@link #setCustomTabColorizer(TabColorizer)}.
*/
View oldSelection = null;
public interface TabColorizer {
/**
* @return return the color of the indicator used when {@code position} is selected.
*/
int getIndicatorColor(int position);
}
private static final int TITLE_OFFSET_DIPS = 24;
private static final int TAB_VIEW_PADDING_DIPS = 8;
private static final int TAB_VIEW_TEXT_SIZE_SP = 12;
private int mTitleOffset;
private int mTabViewLayoutId;
private int mTabViewTextViewId;
private boolean mDistributeEvenly;
private ViewPager mViewPager;
private SparseArray<String> mContentDescriptions = new SparseArray<String>();
private ViewPager.OnPageChangeListener mViewPagerPageChangeListener;
private final SlidingTabStrip mTabStrip;
public SlidingTabLayout(Context context) {
this(context, null);
}
public SlidingTabLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public SlidingTabLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// Disable the Scroll Bar
setHorizontalScrollBarEnabled(false);
// Make sure that the Tab Strips fills this View
setFillViewport(true);
mTitleOffset = (int) (TITLE_OFFSET_DIPS * getResources().getDisplayMetrics().density);
mTabStrip = new SlidingTabStrip(context);
addView(mTabStrip, LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
}
public void hideTab(int tabIndex){
for (int i = 0; i < mTabStrip.getChildCount(); i++) {
if(i == tabIndex){
((TextView)mTabStrip.getChildAt(i)).setVisibility(GONE);
}
}
}
/**
* Set the custom {@link TabColorizer} to be used.
*
* If you only require simple custmisation then you can use
* {@link #setSelectedIndicatorColors(int...)} to achieve
* similar effects.
*/
public void setCustomTabColorizer(TabColorizer tabColorizer) {
mTabStrip.setCustomTabColorizer(tabColorizer);
}
public void setDistributeEvenly(boolean distributeEvenly) {
mDistributeEvenly = distributeEvenly;
}
/**
* Sets the colors to be used for indicating the selected tab. These colors are treated as a
* circular array. Providing one color will mean that all tabs are indicated with the same color.
*/
public void setSelectedIndicatorColors(int... colors) {
mTabStrip.setSelectedIndicatorColors(colors);
}
/**
* Set the {@link ViewPager.OnPageChangeListener}. When using {@link SlidingTabLayout} you are
* required to set any {@link ViewPager.OnPageChangeListener} through this method. This is so
* that the layout can update it's scroll position correctly.
*
* @see ViewPager#setOnPageChangeListener(ViewPager.OnPageChangeListener)
*/
public void setOnPageChangeListener(ViewPager.OnPageChangeListener listener) {
mViewPagerPageChangeListener = listener;
}
/**
* Set the custom layout to be inflated for the tab views.
*
* @param layoutResId Layout id to be inflated
* @param textViewId id of the {@link TextView} in the inflated view
*/
public void setCustomTabView(int layoutResId, int textViewId) {
mTabViewLayoutId = layoutResId;
mTabViewTextViewId = textViewId;
}
/**
* Sets the associated view pager. Note that the assumption here is that the pager content
* (number of tabs and tab titles) does not change after this call has been made.
*/
public void setViewPager(ViewPager viewPager) {
mTabStrip.removeAllViews();
mViewPager = viewPager;
if (viewPager != null) {
viewPager.setOnPageChangeListener(new InternalViewPagerListener());
populateTabStrip();
}
}
/**
* Create a default view to be used for tabs. This is called if a custom tab view is not set via
* {@link #setCustomTabView(int, int)}.
*/
protected TextView createDefaultTabView(Context context) {
TextView textView = new TextView(context);
textView.setGravity(Gravity.CENTER);
textView.setTextSize(16);
textView.setTypeface(Constants.TYPE_FACE_FONT_MEDIUM);
textView.setLayoutParams(new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
TypedValue outValue = new TypedValue();
getContext().getTheme().resolveAttribute(android.R.attr.selectableItemBackground,
outValue, true);
textView.setBackgroundResource(outValue.resourceId);
if(Constants.PRODUCT_DETAILS_TAB_BAR_STYLE == 2) {
textView.setBackgroundColor(getResources().getColor(R.color.tab_bar_color));
mTabStrip.setBackgroundColor(getResources().getColor(R.color.tab_bar_color));
}
textView.setAllCaps(true);
int padding = (int) (TAB_VIEW_PADDING_DIPS * getResources().getDisplayMetrics().density);
textView.setPadding(padding, padding, padding, padding);
return textView;
}
private void populateTabStrip() {
removeOldSelection();
oldSelection = null;
final PagerAdapter adapter = mViewPager.getAdapter();
final View.OnClickListener tabClickListener = new TabClickListener();
for (int i = 0; i < adapter.getCount(); i++) {
View tabView = null;
TextView tabTitleView = null;
if (mTabViewLayoutId != 0) {
// If there is a custom tab view layout id set, try and inflate it
tabView = LayoutInflater.from(getContext()).inflate(mTabViewLayoutId, mTabStrip,
false);
tabTitleView = (TextView) tabView.findViewById(mTabViewTextViewId);
}
if (tabView == null) {
tabView = createDefaultTabView(getContext());
}
if (tabTitleView == null && TextView.class.isInstance(tabView)) {
tabTitleView = (TextView) tabView;
}
if (mDistributeEvenly) {
LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) tabView.getLayoutParams();
lp.width = 0;
lp.weight = 1;
}
tabTitleView.setText(adapter.getPageTitle(i));
tabView.setOnClickListener(tabClickListener);
String desc = mContentDescriptions.get(i, null);
if (desc != null) {
tabView.setContentDescription(desc);
}
mTabStrip.addView(tabView);
if(Constants.PRODUCT_DETAILS_TAB_BAR_STYLE == 1)
tabTitleView.setTextColor(getResources().getColorStateList(R.color.primary_ultralight));
else
tabTitleView.setTextColor(getResources().getColor(R.color.primary_text));
if (i == mViewPager.getCurrentItem()) {
tabView.setSelected(true);
tabTitleView.setTextColor(getResources().getColorStateList(R.color.primary_ultralight));
}
}
}
public void setContentDescription(int i, String desc) {
mContentDescriptions.put(i, desc);
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
if (mViewPager != null) {
scrollToTab(mViewPager.getCurrentItem(), 0);
}
}
private void scrollToTab(int tabIndex, int positionOffset) {
final int tabStripChildCount = mTabStrip.getChildCount();
if (tabStripChildCount == 0 || tabIndex < 0 || tabIndex >= tabStripChildCount) {
return;
}
View selectedChild = mTabStrip.getChildAt(tabIndex);
if (selectedChild != null) {
if(positionOffset == 0 && selectedChild != oldSelection) { // added part
selectedChild.setSelected(true);
removeOldSelection();
oldSelection = selectedChild;
}
int targetScrollX = selectedChild.getLeft() + positionOffset;
if (tabIndex > 0 || positionOffset > 0) {
// If we're not at the first child and are mid-scroll, make sure we obey the offset
targetScrollX -= mTitleOffset;
}
scrollTo(targetScrollX, 0);
}
}
private class InternalViewPagerListener implements ViewPager.OnPageChangeListener {
private int mScrollState;
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
int tabStripChildCount = mTabStrip.getChildCount();
if ((tabStripChildCount == 0) || (position < 0) || (position >= tabStripChildCount)) {
return;
}
mTabStrip.onViewPagerPageChanged(position, positionOffset);
View selectedTitle = mTabStrip.getChildAt(position);
int extraOffset = (selectedTitle != null)
? (int) (positionOffset * selectedTitle.getWidth())
: 0;
scrollToTab(position, extraOffset);
if (mViewPagerPageChangeListener != null) {
mViewPagerPageChangeListener.onPageScrolled(position, positionOffset,
positionOffsetPixels);
}
}
@Override
public void onPageScrollStateChanged(int state) {
mScrollState = state;
if (mViewPagerPageChangeListener != null) {
mViewPagerPageChangeListener.onPageScrollStateChanged(state);
}
}
@Override
public void onPageSelected(int position) {
if (mScrollState == ViewPager.SCROLL_STATE_IDLE) {
mTabStrip.onViewPagerPageChanged(position, 0f);
scrollToTab(position, 0);
}
for (int i = 0; i < mTabStrip.getChildCount(); i++) {
mTabStrip.getChildAt(i).setSelected(position == i);
if(Constants.PRODUCT_DETAILS_TAB_BAR_STYLE == 2){
if(position == i)
((TextView)mTabStrip.getChildAt(i)).setTextColor(getResources().getColorStateList(R.color.primary_ultralight));
else
((TextView)mTabStrip.getChildAt(i)).setTextColor(getResources().getColor(R.color.primary_text));
}
}
if (mViewPagerPageChangeListener != null) {
mViewPagerPageChangeListener.onPageSelected(position);
}
}
}
private void removeOldSelection() {
if(oldSelection != null) {
oldSelection.setSelected(false);
}
}
private class TabClickListener implements View.OnClickListener {
@Override
public void onClick(View v) {
for (int i = 0; i < mTabStrip.getChildCount(); i++) {
if (v == mTabStrip.getChildAt(i)) {
mViewPager.setCurrentItem(i);
return;
}
}
}
}
}
SlidingTabStrip:
class SlidingTabStrip extends LinearLayout {
private static final int DEFAULT_BOTTOM_BORDER_THICKNESS_DIPS = 0;
private static final byte DEFAULT_BOTTOM_BORDER_COLOR_ALPHA = 0x26;
private static final int SELECTED_INDICATOR_THICKNESS_DIPS = 3;
private static final int DEFAULT_SELECTED_INDICATOR_COLOR = 0xFF33B5E5;
private final int mBottomBorderThickness;
private final Paint mBottomBorderPaint;
private final int mSelectedIndicatorThickness;
private final Paint mSelectedIndicatorPaint;
private final int mDefaultBottomBorderColor;
private int mSelectedPosition;
private float mSelectionOffset;
private SlidingTabLayout.TabColorizer mCustomTabColorizer;
private final SimpleTabColorizer mDefaultTabColorizer;
SlidingTabStrip(Context context) {
this(context, null);
}
SlidingTabStrip(Context context, AttributeSet attrs) {
super(context, attrs);
setWillNotDraw(false);
final float density = getResources().getDisplayMetrics().density;
TypedValue outValue = new TypedValue();
context.getTheme().resolveAttribute(android.R.attr.colorForeground, outValue, true);
final int themeForegroundColor = outValue.data;
mDefaultBottomBorderColor = setColorAlpha(themeForegroundColor,
DEFAULT_BOTTOM_BORDER_COLOR_ALPHA);
mDefaultTabColorizer = new SimpleTabColorizer();
mDefaultTabColorizer.setIndicatorColors(DEFAULT_SELECTED_INDICATOR_COLOR);
mBottomBorderThickness = (int) (DEFAULT_BOTTOM_BORDER_THICKNESS_DIPS * density);
mBottomBorderPaint = new Paint();
mBottomBorderPaint.setColor(mDefaultBottomBorderColor);
mSelectedIndicatorThickness = (int) (SELECTED_INDICATOR_THICKNESS_DIPS * density);
mSelectedIndicatorPaint = new Paint();
}
void setCustomTabColorizer(SlidingTabLayout.TabColorizer customTabColorizer) {
mCustomTabColorizer = customTabColorizer;
invalidate();
}
void setSelectedIndicatorColors(int... colors) {
// Make sure that the custom colorizer is removed
mCustomTabColorizer = null;
mDefaultTabColorizer.setIndicatorColors(colors);
invalidate();
}
void onViewPagerPageChanged(int position, float positionOffset) {
mSelectedPosition = position;
mSelectionOffset = positionOffset;
invalidate();
}
@Override
protected void onDraw(Canvas canvas) {
final int height = getHeight();
final int childCount = getChildCount();
final SlidingTabLayout.TabColorizer tabColorizer = mCustomTabColorizer != null
? mCustomTabColorizer
: mDefaultTabColorizer;
// Thick colored underline below the current selection
if (childCount > 0) {
View selectedTitle = getChildAt(mSelectedPosition);
int left = selectedTitle.getLeft();
int right = selectedTitle.getRight();
int color = tabColorizer.getIndicatorColor(mSelectedPosition);
if (mSelectionOffset > 0f && mSelectedPosition < (getChildCount() - 1)) {
int nextColor = tabColorizer.getIndicatorColor(mSelectedPosition + 1);
if (color != nextColor) {
color = blendColors(nextColor, color, mSelectionOffset);
}
// Draw the selection partway between the tabs
View nextTitle = getChildAt(mSelectedPosition + 1);
left = (int) (mSelectionOffset * nextTitle.getLeft() +
(1.0f - mSelectionOffset) * left);
right = (int) (mSelectionOffset * nextTitle.getRight() +
(1.0f - mSelectionOffset) * right);
}
mSelectedIndicatorPaint.setColor(color);
canvas.drawRect(left, height - mSelectedIndicatorThickness, right,
height, mSelectedIndicatorPaint);
}
// Thin underline along the entire bottom edge
canvas.drawRect(0, height - mBottomBorderThickness, getWidth(), height, mBottomBorderPaint);
}
/**
* Set the alpha value of the {@code color} to be the given {@code alpha} value.
*/
private static int setColorAlpha(int color, byte alpha) {
return Color.argb(alpha, Color.red(color), Color.green(color), Color.blue(color));
}
/**
* Blend {@code color1} and {@code color2} using the given ratio.
*
* @param ratio of which to blend. 1.0 will return {@code color1}, 0.5 will give an even blend,
* 0.0 will return {@code color2}.
*/
private static int blendColors(int color1, int color2, float ratio) {
final float inverseRation = 1f - ratio;
float r = (Color.red(color1) * ratio) + (Color.red(color2) * inverseRation);
float g = (Color.green(color1) * ratio) + (Color.green(color2) * inverseRation);
float b = (Color.blue(color1) * ratio) + (Color.blue(color2) * inverseRation);
return Color.rgb((int) r, (int) g, (int) b);
}
private static class SimpleTabColorizer implements SlidingTabLayout.TabColorizer {
private int[] mIndicatorColors;
@Override
public final int getIndicatorColor(int position) {
return mIndicatorColors[position % mIndicatorColors.length];
}
void setIndicatorColors(int... colors) {
mIndicatorColors = colors;
}
}
}
以及使用方法：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:background="@color/layouts_background"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<RelativeLayout
android:id="@+id/page_root_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<include
android:id="@+id/app_bar"
layout="@layout/app_bar"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/app_bar"
android:orientation="vertical">
<com.app.myapp.tab.SlidingTabLayout
android:id="@+id/detailsTabs"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</com.app.myapp.tab.SlidingTabLayout>
<android.support.v4.view.ViewPager
android:id="@+id/detailsPager"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
</android.support.v4.view.ViewPager>
</LinearLayout>
</RelativeLayout>
</LinearLayout>
</RelativeLayout>
工具栏作为应用栏：
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="?android:attr/actionBarSize"
android:background="@color/primary"
app:theme="@style/CustomToolbarTheme">
</android.support.v7.widget.Toolbar>
在Activity中：
class DetailsTabsAdaptor extends FragmentPagerAdapter {
String [] tabsTitlesPrepare = {getString(R.string.details),getString(R.string.features), getString(R.string.spects), getString(R.string.downloads)};
List<String> tabsTitles = new ArrayList<>();
int tabsCount = 0;
boolean featuresExist = false;
boolean specificationsExist = false;
boolean downloadsExist = false;
public DetailsTabsAdaptor(FragmentManager fm) {
super(fm);
tabsTitles.add(tabsTitlesPrepare[0]);
tabsCount++;
if ((mProductDetails.ProductStructure.Features != null && mProductDetails.ProductStructure.Features.size()>0)) {
tabsTitles.add(tabsTitlesPrepare[1]);
featuresExist = true;
tabsCount++;
}
if ((mProductDetails.ProductStructure.SpecificationBlocks != null && mProductDetails.ProductStructure.SpecificationBlocks.size()>0)) {
tabsTitles.add(tabsTitlesPrepare[2]);
specificationsExist = true;
tabsCount++;
}
if ((mProductDetails.ProductStructure.SupportFiles != null && mProductDetails.ProductStructure.SupportFiles.size()>0)) {
tabsTitles.add(tabsTitlesPrepare[3]);
downloadsExist = true;
tabsCount++;
}
}
@Override
public CharSequence getPageTitle(int position) {
return tabsTitles.get(position);
}
@Override
public Fragment getItem(int position) {
if(position == 0){
ProductDetailsFragment fragment = new ProductDetailsFragment();
return fragment;
}
if(position == 1 && featuresExist){
ProductFeaturesFragment fragment = new ProductFeaturesFragment();
return fragment;
}
if((position == 2 && specificationsExist) || (position == 1 && (!featuresExist) && specificationsExist)){
ProductSpectsFragment fragment = new ProductSpectsFragment();
return fragment;
}
if((position == 3 && downloadsExist) || (position == 1 && (!featuresExist) && (!specificationsExist) && downloadsExist ) ||
(position == 2 && (!specificationsExist) && downloadsExist )){
ProductDownloadsFragment fragment = new ProductDownloadsFragment();
return fragment;
}
return null;
}
@Override
public int getCount() {
return tabsCount;
}
}
和设置选项卡
public void setupTabs() {
mDetailsPager.setAdapter(new DetailsTabsAdaptor(getSupportFragmentManager()));
mDetailsTabs.setViewPager(mDetailsPager);
mDetailsTabs.setBackgroundResource(R.color.primary);
mDetailsTabs.setCustomTabView(R.layout.custom_details_view_tab_layout, R.id.tabText);
mDetailsTabs.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() {
@Override
public int getIndicatorColor(int position) {
return getResources().getColor(R.color.primary_light);
}
});
mDetailsTabs.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
for (int i = 0; i < mDetailsTabs.getChildCount(); i++)
mDetailsTabs.getChildAt(i).setSelected(i == position);
if (position == DESCRIPTION_PAGE_ID)
mFavoritesButton.setVisibility(View.VISIBLE);
else
mFavoritesButton.setVisibility(View.GONE);
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
}
custom_details_view_tab_layout :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:background="@color/primary"
android:layout_height="match_parent">
<com.avad.avaddroid.customModels.TextViewMedium
android:id="@+id/tabText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="@color/primary_light"
android:layout_gravity="center"/>
</LinearLayout>
最后说明：这里不贴出所有变量的初始化，大家不要偷懒尝试学习一下；）
请设置viewPager.setOffscreenPageLimit(1);到 viewPager.setOffscreenPageLimit(5);
我刚刚查看了您的代码。问题是您没有提供任何布局以在 ContentFragment.java 内膨胀。
我把你的方法改成了
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
//return super.onCreateView(inflater, container, savedInstanceState);
return inflater.inflate(R.layout.feed_item, container, false);
}
进行这些更改后，您的标签页滚动顺畅。我不知道这种行为背后的原因，但这件事让它起作用
在 Activity 中更改此行：
ViewPagerAdapter adapter = new ViewPagerAdapter(getChildFragmentManager());
如果您要在片段中创建 TabLayout，则使用 getChildFragmentManager() 而不是 getSupportFragmentManager() 作为参数。
ViewPagerAdapter adapter = new ViewPagerAdapter(getChildFragmentManager());
编辑
我已经按照这些教程解决了这个问题。
http://www.truiton.com/2015/06/android-tabs-example-fragments-viewpager/ https://guides.codepath.com/android/google-play-style-tabs-using-tablayout http://www.voidynullness.net/blog/2015/08/16/android-tablayout-design-support-library-tutorial/
但在尝试了多种解决方案后，问题仍然存在，这很烦人。这是问题的演示，我 facing.Its 已经好几周没被困在这个问题上了。
Link 用于演示。
我用于测试的设备是 Nexus 4 和 Nexus 5。
TabLayout 和 ViewPager 滚动不流畅。我需要滑动两次才能在下次点击时移动。我环顾了网络，但找不到任何解决方案。
我正在使用最新的支持设计库。
这里是 gradle 文件
apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion "23.0.3"
defaultConfig {
applicationId "com.softoven.ultron"
minSdkVersion 15
targetSdkVersion 23
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.3.0'
compile 'com.android.support:design:23.3.0'
compile 'org.jsoup:jsoup:1.6.1'
compile 'com.mikhaellopez:circularimageview:3.0.0'
compile 'com.android.support:recyclerview-v7:23.3.0'
compile 'com.mcxiaoke.volley:library:1.0.19'
compile 'com.nostra13.universalimageloader:universal-image-loader:1.9.5'
compile 'com.google.code.gson:gson:2.5'
}
这是Activity代码。
private DrawerLayout drawerLayout;
private ViewPager viewPager;
private TabLayout tabLayout;
private NavigationView navigationView;
private CategoriesDTO categoriesDTO;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initToolbar();
initUi();
loadCategories();
}
private void initToolbar() {
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeAsUpIndicator(R.drawable.ic_action_menu);
}
private void initUi() {
drawerLayout = (DrawerLayout) findViewById(R.id.drawer);
navigationView = (NavigationView) findViewById(R.id.navigation);
viewPager = (ViewPager) findViewById(R.id.viewPager);
tabLayout = (TabLayout) findViewById(R.id.tab);
}
private void loadCategories() {
StringRequest request = new StringRequest(Constants.URL_GET_CATEGORIES, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
categoriesDTO = Constants.gson.fromJson(response, CategoriesDTO.class);
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
viewPager.setOffscreenPageLimit(1);
viewPager.setAdapter(adapter);
setTabLayout();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
});
ApplicationController.getmInstance().addToRequestQueue(request);
}
private void setTabLayout() {
tabLayout.setupWithViewPager(viewPager);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.menu.home_side_menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
switch (id) {
case android.R.id.home:
drawerLayout.openDrawer(GravityCompat.START);
return true;
}
return super.onOptionsItemSelected(item);
}
private class ViewPagerAdapter extends FragmentPagerAdapter {
public ViewPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
return new ContentFragment();
}
@Override
public int getCount() {
return 10;
}
@Override
public CharSequence getPageTitle(int position) {
String title = categoriesDTO.getCategories().get(position).getTitle();
return (CharSequence) title;
}
}
和xml文件
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:id="@+id/app_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<include
android:id="@+id/toolbar"
layout="@layout/toolbar"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
<android.support.design.widget.TabLayout
android:id="@+id/tab"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabTextColor="#fff"
app:tabGravity="fill"
app:tabMode="scrollable"
>
</android.support.design.widget.TabLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="@+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
</android.support.v4.view.ViewPager>
</android.support.design.widget.CoordinatorLayout>
<android.support.design.widget.NavigationView
android:id="@+id/navigation"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
app:menu="@menu/home_drawer_menu">
</android.support.design.widget.NavigationView>
这是您可以看到指标被部分分割的屏幕截图。
有什么解决办法吗？
在您的 Android 清单文件 中将此行添加到 <Application> 标签
android:largeHeap="true"
在您的应用上启用所有 StrictMode 策略以检测您可能无意中在主线程上执行的任何冗长操作，从而导致延迟，以便您可以采取进一步的必要纠正措施。
StrictMode 是一种开发人员工具，可以检测您可能无意中做的事情并提醒您注意它们，以便您进行修复。 StrictMode 最常用于捕获应用程序主线程上的意外磁盘或网络访问，其中接收 UI 操作并发生动画。
详情请见https://developer.android.com/reference/android/os/StrictMode.html
// Enable all thread strict mode policies
StrictMode.ThreadPolicy.Builder threadPolicyBuilder = new StrictMode.ThreadPolicy.Builder();
// Detect everything that's potentially suspect
threadPolicyBuilder.detectAll();
// Crash the whole process on violation
threadPolicyBuilder.penaltyDeath();
// Log detected violations to the system log
threadPolicyBuilder.penaltyLog();
// Crash the whole process on any network usage.
threadPolicyBuilder.penaltyDeathOnNetwork();
StrictMode.ThreadPolicy threadPolicy = threadPolicyBuilder.build();
StrictMode.setThreadPolicy(threadPolicy);
// Enable all VM strict mode policies
StrictMode.VmPolicy.Builder vmPolicyBuilder = new StrictMode.VmPolicy.Builder();
// Detect everything that's potentially suspect
vmPolicyBuilder.detectAll();
// Log detected violations to the system log
vmPolicyBuilder.penaltyLog();
StrictMode.VmPolicy vmPolicy = vmPolicyBuilder.build();
StrictMode.setVmPolicy(vmPolicy);
I think you need to use
overridemethodsetUserVisibleHint.You need to add this in your
Fragment.
@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
super.setUserVisibleHint(isVisibleToUser);
if (isVisibleToUser) {
// load data here
}else{
// fragment is no longer visible
}
}
Make your
offScreenPageLimitto NUMBER OF TABS you have.
详细了解 setUserVisibleHint here。
这对于android的坐标布局和appBar布局来说并不是什么新鲜事；我敢肯定，无论您做什么，都无法使它变得更顺畅。 然而
https://github.com/henrytao-me/smooth-app-bar-layout
这可以满足您的要求； 但是首先从
下载示例应用程序https://play.google.com/store/apps/details?id=me.henrytao.smoothappbarlayout
看看它是否符合您的需要。（只是为了确定）
首先，为了让一切顺利，不要在主线程上进行大量操作，使用异步任务（不要在异步任务中触摸视图），无论如何都会顺利:)
试试我的方法：
SlidingTabLayout:
public class SlidingTabLayout extends HorizontalScrollView {
/**
* Allows complete control over the colors drawn in the tab layout. Set with
* {@link #setCustomTabColorizer(TabColorizer)}.
*/
View oldSelection = null;
public interface TabColorizer {
/**
* @return return the color of the indicator used when {@code position} is selected.
*/
int getIndicatorColor(int position);
}
private static final int TITLE_OFFSET_DIPS = 24;
private static final int TAB_VIEW_PADDING_DIPS = 8;
private static final int TAB_VIEW_TEXT_SIZE_SP = 12;
private int mTitleOffset;
private int mTabViewLayoutId;
private int mTabViewTextViewId;
private boolean mDistributeEvenly;
private ViewPager mViewPager;
private SparseArray<String> mContentDescriptions = new SparseArray<String>();
private ViewPager.OnPageChangeListener mViewPagerPageChangeListener;
private final SlidingTabStrip mTabStrip;
public SlidingTabLayout(Context context) {
this(context, null);
}
public SlidingTabLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public SlidingTabLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// Disable the Scroll Bar
setHorizontalScrollBarEnabled(false);
// Make sure that the Tab Strips fills this View
setFillViewport(true);
mTitleOffset = (int) (TITLE_OFFSET_DIPS * getResources().getDisplayMetrics().density);
mTabStrip = new SlidingTabStrip(context);
addView(mTabStrip, LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
}
public void hideTab(int tabIndex){
for (int i = 0; i < mTabStrip.getChildCount(); i++) {
if(i == tabIndex){
((TextView)mTabStrip.getChildAt(i)).setVisibility(GONE);
}
}
}
/**
* Set the custom {@link TabColorizer} to be used.
*
* If you only require simple custmisation then you can use
* {@link #setSelectedIndicatorColors(int...)} to achieve
* similar effects.
*/
public void setCustomTabColorizer(TabColorizer tabColorizer) {
mTabStrip.setCustomTabColorizer(tabColorizer);
}
public void setDistributeEvenly(boolean distributeEvenly) {
mDistributeEvenly = distributeEvenly;
}
/**
* Sets the colors to be used for indicating the selected tab. These colors are treated as a
* circular array. Providing one color will mean that all tabs are indicated with the same color.
*/
public void setSelectedIndicatorColors(int... colors) {
mTabStrip.setSelectedIndicatorColors(colors);
}
/**
* Set the {@link ViewPager.OnPageChangeListener}. When using {@link SlidingTabLayout} you are
* required to set any {@link ViewPager.OnPageChangeListener} through this method. This is so
* that the layout can update it's scroll position correctly.
*
* @see ViewPager#setOnPageChangeListener(ViewPager.OnPageChangeListener)
*/
public void setOnPageChangeListener(ViewPager.OnPageChangeListener listener) {
mViewPagerPageChangeListener = listener;
}
/**
* Set the custom layout to be inflated for the tab views.
*
* @param layoutResId Layout id to be inflated
* @param textViewId id of the {@link TextView} in the inflated view
*/
public void setCustomTabView(int layoutResId, int textViewId) {
mTabViewLayoutId = layoutResId;
mTabViewTextViewId = textViewId;
}
/**
* Sets the associated view pager. Note that the assumption here is that the pager content
* (number of tabs and tab titles) does not change after this call has been made.
*/
public void setViewPager(ViewPager viewPager) {
mTabStrip.removeAllViews();
mViewPager = viewPager;
if (viewPager != null) {
viewPager.setOnPageChangeListener(new InternalViewPagerListener());
populateTabStrip();
}
}
/**
* Create a default view to be used for tabs. This is called if a custom tab view is not set via
* {@link #setCustomTabView(int, int)}.
*/
protected TextView createDefaultTabView(Context context) {
TextView textView = new TextView(context);
textView.setGravity(Gravity.CENTER);
textView.setTextSize(16);
textView.setTypeface(Constants.TYPE_FACE_FONT_MEDIUM);
textView.setLayoutParams(new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
TypedValue outValue = new TypedValue();
getContext().getTheme().resolveAttribute(android.R.attr.selectableItemBackground,
outValue, true);
textView.setBackgroundResource(outValue.resourceId);
if(Constants.PRODUCT_DETAILS_TAB_BAR_STYLE == 2) {
textView.setBackgroundColor(getResources().getColor(R.color.tab_bar_color));
mTabStrip.setBackgroundColor(getResources().getColor(R.color.tab_bar_color));
}
textView.setAllCaps(true);
int padding = (int) (TAB_VIEW_PADDING_DIPS * getResources().getDisplayMetrics().density);
textView.setPadding(padding, padding, padding, padding);
return textView;
}
private void populateTabStrip() {
removeOldSelection();
oldSelection = null;
final PagerAdapter adapter = mViewPager.getAdapter();
final View.OnClickListener tabClickListener = new TabClickListener();
for (int i = 0; i < adapter.getCount(); i++) {
View tabView = null;
TextView tabTitleView = null;
if (mTabViewLayoutId != 0) {
// If there is a custom tab view layout id set, try and inflate it
tabView = LayoutInflater.from(getContext()).inflate(mTabViewLayoutId, mTabStrip,
false);
tabTitleView = (TextView) tabView.findViewById(mTabViewTextViewId);
}
if (tabView == null) {
tabView = createDefaultTabView(getContext());
}
if (tabTitleView == null && TextView.class.isInstance(tabView)) {
tabTitleView = (TextView) tabView;
}
if (mDistributeEvenly) {
LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) tabView.getLayoutParams();
lp.width = 0;
lp.weight = 1;
}
tabTitleView.setText(adapter.getPageTitle(i));
tabView.setOnClickListener(tabClickListener);
String desc = mContentDescriptions.get(i, null);
if (desc != null) {
tabView.setContentDescription(desc);
}
mTabStrip.addView(tabView);
if(Constants.PRODUCT_DETAILS_TAB_BAR_STYLE == 1)
tabTitleView.setTextColor(getResources().getColorStateList(R.color.primary_ultralight));
else
tabTitleView.setTextColor(getResources().getColor(R.color.primary_text));
if (i == mViewPager.getCurrentItem()) {
tabView.setSelected(true);
tabTitleView.setTextColor(getResources().getColorStateList(R.color.primary_ultralight));
}
}
}
public void setContentDescription(int i, String desc) {
mContentDescriptions.put(i, desc);
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
if (mViewPager != null) {
scrollToTab(mViewPager.getCurrentItem(), 0);
}
}
private void scrollToTab(int tabIndex, int positionOffset) {
final int tabStripChildCount = mTabStrip.getChildCount();
if (tabStripChildCount == 0 || tabIndex < 0 || tabIndex >= tabStripChildCount) {
return;
}
View selectedChild = mTabStrip.getChildAt(tabIndex);
if (selectedChild != null) {
if(positionOffset == 0 && selectedChild != oldSelection) { // added part
selectedChild.setSelected(true);
removeOldSelection();
oldSelection = selectedChild;
}
int targetScrollX = selectedChild.getLeft() + positionOffset;
if (tabIndex > 0 || positionOffset > 0) {
// If we're not at the first child and are mid-scroll, make sure we obey the offset
targetScrollX -= mTitleOffset;
}
scrollTo(targetScrollX, 0);
}
}
private class InternalViewPagerListener implements ViewPager.OnPageChangeListener {
private int mScrollState;
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
int tabStripChildCount = mTabStrip.getChildCount();
if ((tabStripChildCount == 0) || (position < 0) || (position >= tabStripChildCount)) {
return;
}
mTabStrip.onViewPagerPageChanged(position, positionOffset);
View selectedTitle = mTabStrip.getChildAt(position);
int extraOffset = (selectedTitle != null)
? (int) (positionOffset * selectedTitle.getWidth())
: 0;
scrollToTab(position, extraOffset);
if (mViewPagerPageChangeListener != null) {
mViewPagerPageChangeListener.onPageScrolled(position, positionOffset,
positionOffsetPixels);
}
}
@Override
public void onPageScrollStateChanged(int state) {
mScrollState = state;
if (mViewPagerPageChangeListener != null) {
mViewPagerPageChangeListener.onPageScrollStateChanged(state);
}
}
@Override
public void onPageSelected(int position) {
if (mScrollState == ViewPager.SCROLL_STATE_IDLE) {
mTabStrip.onViewPagerPageChanged(position, 0f);
scrollToTab(position, 0);
}
for (int i = 0; i < mTabStrip.getChildCount(); i++) {
mTabStrip.getChildAt(i).setSelected(position == i);
if(Constants.PRODUCT_DETAILS_TAB_BAR_STYLE == 2){
if(position == i)
((TextView)mTabStrip.getChildAt(i)).setTextColor(getResources().getColorStateList(R.color.primary_ultralight));
else
((TextView)mTabStrip.getChildAt(i)).setTextColor(getResources().getColor(R.color.primary_text));
}
}
if (mViewPagerPageChangeListener != null) {
mViewPagerPageChangeListener.onPageSelected(position);
}
}
}
private void removeOldSelection() {
if(oldSelection != null) {
oldSelection.setSelected(false);
}
}
private class TabClickListener implements View.OnClickListener {
@Override
public void onClick(View v) {
for (int i = 0; i < mTabStrip.getChildCount(); i++) {
if (v == mTabStrip.getChildAt(i)) {
mViewPager.setCurrentItem(i);
return;
}
}
}
}
}
SlidingTabStrip:
class SlidingTabStrip extends LinearLayout {
private static final int DEFAULT_BOTTOM_BORDER_THICKNESS_DIPS = 0;
private static final byte DEFAULT_BOTTOM_BORDER_COLOR_ALPHA = 0x26;
private static final int SELECTED_INDICATOR_THICKNESS_DIPS = 3;
private static final int DEFAULT_SELECTED_INDICATOR_COLOR = 0xFF33B5E5;
private final int mBottomBorderThickness;
private final Paint mBottomBorderPaint;
private final int mSelectedIndicatorThickness;
private final Paint mSelectedIndicatorPaint;
private final int mDefaultBottomBorderColor;
private int mSelectedPosition;
private float mSelectionOffset;
private SlidingTabLayout.TabColorizer mCustomTabColorizer;
private final SimpleTabColorizer mDefaultTabColorizer;
SlidingTabStrip(Context context) {
this(context, null);
}
SlidingTabStrip(Context context, AttributeSet attrs) {
super(context, attrs);
setWillNotDraw(false);
final float density = getResources().getDisplayMetrics().density;
TypedValue outValue = new TypedValue();
context.getTheme().resolveAttribute(android.R.attr.colorForeground, outValue, true);
final int themeForegroundColor = outValue.data;
mDefaultBottomBorderColor = setColorAlpha(themeForegroundColor,
DEFAULT_BOTTOM_BORDER_COLOR_ALPHA);
mDefaultTabColorizer = new SimpleTabColorizer();
mDefaultTabColorizer.setIndicatorColors(DEFAULT_SELECTED_INDICATOR_COLOR);
mBottomBorderThickness = (int) (DEFAULT_BOTTOM_BORDER_THICKNESS_DIPS * density);
mBottomBorderPaint = new Paint();
mBottomBorderPaint.setColor(mDefaultBottomBorderColor);
mSelectedIndicatorThickness = (int) (SELECTED_INDICATOR_THICKNESS_DIPS * density);
mSelectedIndicatorPaint = new Paint();
}
void setCustomTabColorizer(SlidingTabLayout.TabColorizer customTabColorizer) {
mCustomTabColorizer = customTabColorizer;
invalidate();
}
void setSelectedIndicatorColors(int... colors) {
// Make sure that the custom colorizer is removed
mCustomTabColorizer = null;
mDefaultTabColorizer.setIndicatorColors(colors);
invalidate();
}
void onViewPagerPageChanged(int position, float positionOffset) {
mSelectedPosition = position;
mSelectionOffset = positionOffset;
invalidate();
}
@Override
protected void onDraw(Canvas canvas) {
final int height = getHeight();
final int childCount = getChildCount();
final SlidingTabLayout.TabColorizer tabColorizer = mCustomTabColorizer != null
? mCustomTabColorizer
: mDefaultTabColorizer;
// Thick colored underline below the current selection
if (childCount > 0) {
View selectedTitle = getChildAt(mSelectedPosition);
int left = selectedTitle.getLeft();
int right = selectedTitle.getRight();
int color = tabColorizer.getIndicatorColor(mSelectedPosition);
if (mSelectionOffset > 0f && mSelectedPosition < (getChildCount() - 1)) {
int nextColor = tabColorizer.getIndicatorColor(mSelectedPosition + 1);
if (color != nextColor) {
color = blendColors(nextColor, color, mSelectionOffset);
}
// Draw the selection partway between the tabs
View nextTitle = getChildAt(mSelectedPosition + 1);
left = (int) (mSelectionOffset * nextTitle.getLeft() +
(1.0f - mSelectionOffset) * left);
right = (int) (mSelectionOffset * nextTitle.getRight() +
(1.0f - mSelectionOffset) * right);
}
mSelectedIndicatorPaint.setColor(color);
canvas.drawRect(left, height - mSelectedIndicatorThickness, right,
height, mSelectedIndicatorPaint);
}
// Thin underline along the entire bottom edge
canvas.drawRect(0, height - mBottomBorderThickness, getWidth(), height, mBottomBorderPaint);
}
/**
* Set the alpha value of the {@code color} to be the given {@code alpha} value.
*/
private static int setColorAlpha(int color, byte alpha) {
return Color.argb(alpha, Color.red(color), Color.green(color), Color.blue(color));
}
/**
* Blend {@code color1} and {@code color2} using the given ratio.
*
* @param ratio of which to blend. 1.0 will return {@code color1}, 0.5 will give an even blend,
* 0.0 will return {@code color2}.
*/
private static int blendColors(int color1, int color2, float ratio) {
final float inverseRation = 1f - ratio;
float r = (Color.red(color1) * ratio) + (Color.red(color2) * inverseRation);
float g = (Color.green(color1) * ratio) + (Color.green(color2) * inverseRation);
float b = (Color.blue(color1) * ratio) + (Color.blue(color2) * inverseRation);
return Color.rgb((int) r, (int) g, (int) b);
}
private static class SimpleTabColorizer implements SlidingTabLayout.TabColorizer {
private int[] mIndicatorColors;
@Override
public final int getIndicatorColor(int position) {
return mIndicatorColors[position % mIndicatorColors.length];
}
void setIndicatorColors(int... colors) {
mIndicatorColors = colors;
}
}
}
以及使用方法：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:background="@color/layouts_background"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<RelativeLayout
android:id="@+id/page_root_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<include
android:id="@+id/app_bar"
layout="@layout/app_bar"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/app_bar"
android:orientation="vertical">
<com.app.myapp.tab.SlidingTabLayout
android:id="@+id/detailsTabs"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</com.app.myapp.tab.SlidingTabLayout>
<android.support.v4.view.ViewPager
android:id="@+id/detailsPager"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
</android.support.v4.view.ViewPager>
</LinearLayout>
</RelativeLayout>
</LinearLayout>
</RelativeLayout>
工具栏作为应用栏：
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="?android:attr/actionBarSize"
android:background="@color/primary"
app:theme="@style/CustomToolbarTheme">
</android.support.v7.widget.Toolbar>
在Activity中：
class DetailsTabsAdaptor extends FragmentPagerAdapter {
String [] tabsTitlesPrepare = {getString(R.string.details),getString(R.string.features), getString(R.string.spects), getString(R.string.downloads)};
List<String> tabsTitles = new ArrayList<>();
int tabsCount = 0;
boolean featuresExist = false;
boolean specificationsExist = false;
boolean downloadsExist = false;
public DetailsTabsAdaptor(FragmentManager fm) {
super(fm);
tabsTitles.add(tabsTitlesPrepare[0]);
tabsCount++;
if ((mProductDetails.ProductStructure.Features != null && mProductDetails.ProductStructure.Features.size()>0)) {
tabsTitles.add(tabsTitlesPrepare[1]);
featuresExist = true;
tabsCount++;
}
if ((mProductDetails.ProductStructure.SpecificationBlocks != null && mProductDetails.ProductStructure.SpecificationBlocks.size()>0)) {
tabsTitles.add(tabsTitlesPrepare[2]);
specificationsExist = true;
tabsCount++;
}
if ((mProductDetails.ProductStructure.SupportFiles != null && mProductDetails.ProductStructure.SupportFiles.size()>0)) {
tabsTitles.add(tabsTitlesPrepare[3]);
downloadsExist = true;
tabsCount++;
}
}
@Override
public CharSequence getPageTitle(int position) {
return tabsTitles.get(position);
}
@Override
public Fragment getItem(int position) {
if(position == 0){
ProductDetailsFragment fragment = new ProductDetailsFragment();
return fragment;
}
if(position == 1 && featuresExist){
ProductFeaturesFragment fragment = new ProductFeaturesFragment();
return fragment;
}
if((position == 2 && specificationsExist) || (position == 1 && (!featuresExist) && specificationsExist)){
ProductSpectsFragment fragment = new ProductSpectsFragment();
return fragment;
}
if((position == 3 && downloadsExist) || (position == 1 && (!featuresExist) && (!specificationsExist) && downloadsExist ) ||
(position == 2 && (!specificationsExist) && downloadsExist )){
ProductDownloadsFragment fragment = new ProductDownloadsFragment();
return fragment;
}
return null;
}
@Override
public int getCount() {
return tabsCount;
}
}
和设置选项卡
public void setupTabs() {
mDetailsPager.setAdapter(new DetailsTabsAdaptor(getSupportFragmentManager()));
mDetailsTabs.setViewPager(mDetailsPager);
mDetailsTabs.setBackgroundResource(R.color.primary);
mDetailsTabs.setCustomTabView(R.layout.custom_details_view_tab_layout, R.id.tabText);
mDetailsTabs.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() {
@Override
public int getIndicatorColor(int position) {
return getResources().getColor(R.color.primary_light);
}
});
mDetailsTabs.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
for (int i = 0; i < mDetailsTabs.getChildCount(); i++)
mDetailsTabs.getChildAt(i).setSelected(i == position);
if (position == DESCRIPTION_PAGE_ID)
mFavoritesButton.setVisibility(View.VISIBLE);
else
mFavoritesButton.setVisibility(View.GONE);
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
}
custom_details_view_tab_layout :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:background="@color/primary"
android:layout_height="match_parent">
<com.avad.avaddroid.customModels.TextViewMedium
android:id="@+id/tabText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="@color/primary_light"
android:layout_gravity="center"/>
</LinearLayout>
最后说明：这里不贴出所有变量的初始化，大家不要偷懒尝试学习一下；）
请设置viewPager.setOffscreenPageLimit(1);到 viewPager.setOffscreenPageLimit(5);
我刚刚查看了您的代码。问题是您没有提供任何布局以在 ContentFragment.java 内膨胀。
我把你的方法改成了
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
//return super.onCreateView(inflater, container, savedInstanceState);
return inflater.inflate(R.layout.feed_item, container, false);
}
进行这些更改后，您的标签页滚动顺畅。我不知道这种行为背后的原因，但这件事让它起作用
在 Activity 中更改此行：
ViewPagerAdapter adapter = new ViewPagerAdapter(getChildFragmentManager());
如果您要在片段中创建 TabLayout，则使用 getChildFragmentManager() 而不是 getSupportFragmentManager() 作为参数。
ViewPagerAdapter adapter = new ViewPagerAdapter(getChildFragmentManager());