Android: 如何给TabbedActivity添加自定义tab?
Android: How to add custom tab to TabbedActivity?
我有这个activity:
我在 Android Studio 1.5
中使用新建 Activity->Tabbed Activity 创建了它
他们为我提供了以下代码,这些代码是在您创建此类 activity 时生成的:
public class Main2Activity extends AppCompatActivity {
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link FragmentPagerAdapter} derivative, which will keep every
* loaded fragment in memory. If this becomes too memory intensive, it
* may be best to switch to a
* {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
private SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
private ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
//--------------------------------------------------------------------
//Here is the custom code
View view = getLayoutInflater().inflate(R.layout.custom_tab,null);
view.findViewById(R.id.custom_tab_imageView).setBackgroundResource(R.mipmap.ic_launcher);
TabLayout.Tab tab = tabLayout.newTab().setCustomView(view);
tabLayout.addTab(tab);
//----------------------------------------------------------------------
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main2, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
public PlaceholderFragment() {
}
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main2, container, false);
TextView textView = (TextView) rootView.findViewById(R.id.section_label);
textView.setText(getString(R.string.section_format, getArguments().getInt(ARG_SECTION_NUMBER)));
return rootView;
}
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
return PlaceholderFragment.newInstance(position + 1);
}
@Override
public int getCount() {
// Show 3 total pages.
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "SECTION 1";
case 1:
return "SECTION 2";
case 2:
return "SECTION 3";
}
return null;
}
}
我想在现有的三个选项卡之外添加一个新的自定义选项卡,因此我创建了 custom_tab.xml,其中包含一个 id=custom_tab_imageView 的 ImageView,并将以下内容添加到 onCreate():
View view = getLayoutInflater().inflate(R.layout.custom_tab,null);
view.findViewById(R.id.custom_tab_imageView).setBackgroundResource(R.mipmap.ic_launcher);
TabLayout.Tab tab = tabLayout.newTab().setCustomView(view);
tabLayout.addTab(tab);
在第 1、2、3 节中有一个 PlaceholderFragment 显示 "Hello World from section..."
我需要如何修改 SectionsPagerAdapter 才能在用户点击自定义选项卡时显示 "Hello world from section 4"? 或者我如何让适配器将其识别为第四个选项卡?
所有的魔法都发生在 FragmentPagerAdapter 中。
简而言之,
覆盖 getCount()
方法以定义选项卡的数量。
在 getPageTitle()
方法中定义每个选项卡的标题
当然,ViewPager 的 getItem()
到 return 片段 - link 它与 TabLayout 的位置。
对于您的情况,要添加一个新标签...
在getPageTitle()
方法的switch
块中添加如下case
,在最后位置添加Tab:
case 3:
return 'SECTION 4';
return 来自 getItem()
方法的 Fragment
当位置为 3
:
if (position == 3) {
return <new instance of your Fragment>;
}
更新:
嗯,这个怎么样?
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mViewPager.setCurrentItem(3);
}
});
如果这是你想要的,那么你需要修改你的代码。几乎全部。
这将允许您设置自定义选项卡视图以及图像和文本
创建一个名为 custom_tab.xml
的 xml 布局
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tab"
android:textColor="@color/colorAccent"
android:textSize="@dimen/tab_label"
android:fontFamily="@string/font_fontFamily_medium"/>
使用以下代码行在每个选项卡中呈现 custom_tab.xml 布局。
TextView tabOne = (TextView) LayoutInflater.from(this).inflate(R.layout.custom_tab, null);
tabOne.setText("ONE");
tabOne.setCompoundDrawablesWithIntrinsicBounds(0, R.drawable.ic_tab_favourite, 0, 0);
tabLayout.getTabAt(0).setCustomView(tabOne);
完成class代码:
public class MainActivity extends AppCompatActivity {
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
private int[] tabIcons = {
R.drawable.ic_tab_favourite,
R.drawable.ic_tab_call,
R.drawable.ic_tab_contacts
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
setupTabIcons();
}
private void setupTabIcons() {
TextView tabOne = (TextView) LayoutInflater.from(this).inflate(R.layout.custom_tab, null);
tabOne.setText("ONE");
tabOne.setCompoundDrawablesWithIntrinsicBounds(0, R.drawable.ic_tab_favourite, 0, 0);
tabLayout.getTabAt(0).setCustomView(tabOne);
TextView tabTwo = (TextView) LayoutInflater.from(this).inflate(R.layout.custom_tab, null);
tabTwo.setText("TWO");
tabTwo.setCompoundDrawablesWithIntrinsicBounds(0, R.drawable.ic_tab_call, 0, 0);
tabLayout.getTabAt(1).setCustomView(tabTwo);
TextView tabThree = (TextView) LayoutInflater.from(this).inflate(R.layout.custom_tab, null);
tabThree.setText("THREE");
tabThree.setCompoundDrawablesWithIntrinsicBounds(0, R.drawable.ic_tab_contacts, 0, 0);
tabLayout.getTabAt(2).setCustomView(tabThree);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFrag(new OneFragment(), "ONE");
adapter.addFrag(new TwoFragment(), "TWO");
adapter.addFrag(new ThreeFragment(), "THREE");
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
@Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
@Override
public int getCount() {
return mFragmentList.size();
}
public void addFrag(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
}
我找到了解决方案:
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
switch (position) {
case 0:
return PlaceholderFragment.newInstance("Gallery");
case 1:
return PlaceholderFragment.newInstance("Chat");
case 2:
return PlaceholderFragment.newInstance("People");
default:
return null;
}
}
@Override
public int getCount() {
// Show 3 total pages.
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
/*switch (position) {
case 0:
return "Gallery";
case 1:
return "Chat";
case 2:
return "People";
}*/
// Return null to display only icons
return null;
}
}
创建自定义选项卡并调用 setCustomView()
方法:
private void setupTabIcons() {
View view0 = getLayoutInflater().inflate(R.layout.custom_tab, null);
view0.findViewById(R.id.custom_imageView).setBackgroundResource(tabIcons[0]);
View view1 = getLayoutInflater().inflate(R.layout.custom_tab, null);
view1.findViewById(R.id.custom_imageView).setBackgroundResource(tabIcons[1]);
View view2 = getLayoutInflater().inflate(R.layout.custom_tab, null);
view2.findViewById(R.id.custom_imageView).setBackgroundResource(tabIcons[2]);
tabLayout.getTabAt(0).setCustomView(view0);
tabLayout.getTabAt(1).setCustomView(view1);
tabLayout.getTabAt(2).setCustomView(view2);
}
在 onCreate()
中调用 setupTabIcons()
即可。您有 3 个自定义选项卡连接到 TabbedActivity 的 3 个片段。
我有这个activity:
我在 Android Studio 1.5
中使用新建 Activity->Tabbed Activity 创建了它他们为我提供了以下代码,这些代码是在您创建此类 activity 时生成的:
public class Main2Activity extends AppCompatActivity {
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link FragmentPagerAdapter} derivative, which will keep every
* loaded fragment in memory. If this becomes too memory intensive, it
* may be best to switch to a
* {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
private SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
private ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
//--------------------------------------------------------------------
//Here is the custom code
View view = getLayoutInflater().inflate(R.layout.custom_tab,null);
view.findViewById(R.id.custom_tab_imageView).setBackgroundResource(R.mipmap.ic_launcher);
TabLayout.Tab tab = tabLayout.newTab().setCustomView(view);
tabLayout.addTab(tab);
//----------------------------------------------------------------------
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main2, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
public PlaceholderFragment() {
}
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main2, container, false);
TextView textView = (TextView) rootView.findViewById(R.id.section_label);
textView.setText(getString(R.string.section_format, getArguments().getInt(ARG_SECTION_NUMBER)));
return rootView;
}
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
return PlaceholderFragment.newInstance(position + 1);
}
@Override
public int getCount() {
// Show 3 total pages.
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "SECTION 1";
case 1:
return "SECTION 2";
case 2:
return "SECTION 3";
}
return null;
}
}
我想在现有的三个选项卡之外添加一个新的自定义选项卡,因此我创建了 custom_tab.xml,其中包含一个 id=custom_tab_imageView 的 ImageView,并将以下内容添加到 onCreate():
View view = getLayoutInflater().inflate(R.layout.custom_tab,null);
view.findViewById(R.id.custom_tab_imageView).setBackgroundResource(R.mipmap.ic_launcher);
TabLayout.Tab tab = tabLayout.newTab().setCustomView(view);
tabLayout.addTab(tab);
在第 1、2、3 节中有一个 PlaceholderFragment 显示 "Hello World from section..."
我需要如何修改 SectionsPagerAdapter 才能在用户点击自定义选项卡时显示 "Hello world from section 4"? 或者我如何让适配器将其识别为第四个选项卡?
所有的魔法都发生在 FragmentPagerAdapter 中。
简而言之,
覆盖 getCount()
方法以定义选项卡的数量。
在 getPageTitle()
方法中定义每个选项卡的标题
当然,ViewPager 的 getItem()
到 return 片段 - link 它与 TabLayout 的位置。
对于您的情况,要添加一个新标签...
在
getPageTitle()
方法的switch
块中添加如下case
,在最后位置添加Tab:case 3: return 'SECTION 4';
return 来自
getItem()
方法的Fragment
当位置为3
:if (position == 3) { return <new instance of your Fragment>; }
更新:
嗯,这个怎么样?
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mViewPager.setCurrentItem(3);
}
});
如果这是你想要的,那么你需要修改你的代码。几乎全部。
这将允许您设置自定义选项卡视图以及图像和文本
创建一个名为 custom_tab.xml
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tab"
android:textColor="@color/colorAccent"
android:textSize="@dimen/tab_label"
android:fontFamily="@string/font_fontFamily_medium"/>
使用以下代码行在每个选项卡中呈现 custom_tab.xml 布局。
TextView tabOne = (TextView) LayoutInflater.from(this).inflate(R.layout.custom_tab, null);
tabOne.setText("ONE");
tabOne.setCompoundDrawablesWithIntrinsicBounds(0, R.drawable.ic_tab_favourite, 0, 0);
tabLayout.getTabAt(0).setCustomView(tabOne);
完成class代码:
public class MainActivity extends AppCompatActivity {
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
private int[] tabIcons = {
R.drawable.ic_tab_favourite,
R.drawable.ic_tab_call,
R.drawable.ic_tab_contacts
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
setupTabIcons();
}
private void setupTabIcons() {
TextView tabOne = (TextView) LayoutInflater.from(this).inflate(R.layout.custom_tab, null);
tabOne.setText("ONE");
tabOne.setCompoundDrawablesWithIntrinsicBounds(0, R.drawable.ic_tab_favourite, 0, 0);
tabLayout.getTabAt(0).setCustomView(tabOne);
TextView tabTwo = (TextView) LayoutInflater.from(this).inflate(R.layout.custom_tab, null);
tabTwo.setText("TWO");
tabTwo.setCompoundDrawablesWithIntrinsicBounds(0, R.drawable.ic_tab_call, 0, 0);
tabLayout.getTabAt(1).setCustomView(tabTwo);
TextView tabThree = (TextView) LayoutInflater.from(this).inflate(R.layout.custom_tab, null);
tabThree.setText("THREE");
tabThree.setCompoundDrawablesWithIntrinsicBounds(0, R.drawable.ic_tab_contacts, 0, 0);
tabLayout.getTabAt(2).setCustomView(tabThree);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFrag(new OneFragment(), "ONE");
adapter.addFrag(new TwoFragment(), "TWO");
adapter.addFrag(new ThreeFragment(), "THREE");
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
@Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
@Override
public int getCount() {
return mFragmentList.size();
}
public void addFrag(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
}
我找到了解决方案:
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
switch (position) {
case 0:
return PlaceholderFragment.newInstance("Gallery");
case 1:
return PlaceholderFragment.newInstance("Chat");
case 2:
return PlaceholderFragment.newInstance("People");
default:
return null;
}
}
@Override
public int getCount() {
// Show 3 total pages.
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
/*switch (position) {
case 0:
return "Gallery";
case 1:
return "Chat";
case 2:
return "People";
}*/
// Return null to display only icons
return null;
}
}
创建自定义选项卡并调用 setCustomView()
方法:
private void setupTabIcons() {
View view0 = getLayoutInflater().inflate(R.layout.custom_tab, null);
view0.findViewById(R.id.custom_imageView).setBackgroundResource(tabIcons[0]);
View view1 = getLayoutInflater().inflate(R.layout.custom_tab, null);
view1.findViewById(R.id.custom_imageView).setBackgroundResource(tabIcons[1]);
View view2 = getLayoutInflater().inflate(R.layout.custom_tab, null);
view2.findViewById(R.id.custom_imageView).setBackgroundResource(tabIcons[2]);
tabLayout.getTabAt(0).setCustomView(view0);
tabLayout.getTabAt(1).setCustomView(view1);
tabLayout.getTabAt(2).setCustomView(view2);
}
在 onCreate()
中调用 setupTabIcons()
即可。您有 3 个自定义选项卡连接到 TabbedActivity 的 3 个片段。