如何创建带有圆点指示器的 Android View Pager?
How do you create an Android View Pager with a dots indicator?
可能你们中的许多人(包括我)在创建带有底部点的 ViewPager
时遇到问题,如下所示:
如何创建这样的 Android ViewPager?
我们只需要:ViewPager, TabLayout 和 2 个用于选定点和默认点的可绘制对象。
首先,我们必须将 TabLayout
添加到我们的屏幕布局中,并将其与 ViewPager
连接起来。我们可以通过两种方式做到这一点:
嵌套在 TabLayout
中 ViewPager
<androidx.viewpager.widget.ViewPager
android:id="@+id/photos_viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.tabs.TabLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</androidx.viewpager.widget.ViewPager>
In this case TabLayout
will be automatically connected with ViewPager
, but TabLayout
will be next to ViewPager
, not over it.
分开TabLayout
<androidx.viewpager.widget.ViewPager
android:id="@+id/photos_viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<com.google.android.material.tabs.TabLayout
android:id="@+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
In this case, we can put TabLayout
anywhere, but we have to connect TabLayout
with ViewPager
programmatically
ViewPager pager = (ViewPager) view.findViewById(R.id.photos_viewpager);
PagerAdapter adapter = new PhotosAdapter(getChildFragmentManager(), photosUrl);
pager.setAdapter(adapter);
TabLayout tabLayout = (TabLayout) view.findViewById(R.id.tab_layout);
tabLayout.setupWithViewPager(pager, true);
创建布局后,我们必须准备点。所以我们创建了三个文件:selected_dot.xml
、default_dot.xml
和 tab_selector.xml
.
selected_dot.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
android:innerRadius="0dp"
android:shape="ring"
android:thickness="8dp"
android:useLevel="false">
<solid android:color="@color/colorAccent"/>
</shape>
</item>
</layer-list>
default_dot.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
android:innerRadius="0dp"
android:shape="ring"
android:thickness="8dp"
android:useLevel="false">
<solid android:color="@android:color/darker_gray"/>
</shape>
</item>
</layer-list>
tab_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/selected_dot"
android:state_selected="true"/>
<item android:drawable="@drawable/default_dot"/>
</selector>
现在我们只需要在 XML 布局中向 TabLayout
添加 3 行代码。
app:tabBackground="@drawable/tab_selector"
app:tabGravity="center"
app:tabIndicatorHeight="0dp"
首先创建一个布局,为在您的 View Pager 上显示的点提供一个 LinerLayout
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v4.view.ViewPager
android:id="@+id/view_pager"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<LinearLayout
android:id="@+id/pager_dots"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="10dp"
android:background="@android:color/transparent"
android:gravity="center_horizontal"
android:orientation="horizontal">
</LinearLayout>
</RelativeLayout>
之后创建 2 个可绘制对象
1.未选中的可绘制对象
<?xml version="1.0" encoding="utf-8"?>
<shape android:shape="oval" xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="@android:color/transparent"/>
<size android:width="12dp" android:height="12dp"/>
<stroke android:width="1dp" android:color="#ffffff"/>
</shape>
2。选定的可绘制对象
<?xml version="1.0" encoding="utf-8"?>
<shape android:shape="oval" xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="@android:color/transparent"/>
<size android:width="12dp" android:height="12dp"/>
<stroke android:width="1dp" android:color="#000000"/>
</shape>
之后设置适配器
private LinearLayout llPagerDots;
private ViewPager viewPager;
private ArrayList<String> eventImagesUrl;
private HomeViewPagerAdapter homeViewPagerAdapter;
private ImageView[] ivArrayDotsPager;
public void setUpViewPager() {
viewPager = (ViewPager) findViewById(R.id.view_pager);
llPagerDots = (LinearLayout) findViewById(R.id.pager_dots);
homeViewPagerAdapter = new HomeViewPagerAdapter(mContext, eventImagesUrl);
viewPager.setAdapter(homeViewPagerAdapter);
setupPagerIndidcatorDots();
ivArrayDotsPager[0].setImageResource(R.drawable.page_indicator_selected);
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
for (int i = 0; i < ivArrayDotsPager.length; i++) {
ivArrayDotsPager[i].setImageResource(R.drawable.page_indicator_unselected);
}
ivArrayDotsPager[position].setImageResource(R.drawable.page_indicator_selected);
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
}
创建方法 setupPagerIndidcatorDots() :
private void setupPagerIndidcatorDots() {
ivArrayDotsPager = new ImageView[eventImagesUrl.size()];
for (int i = 0; i < ivArrayDotsPager.length; i++) {
ivArrayDotsPager[i] = new ImageView(getActivity());
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
params.setMargins(5, 0, 5, 0);
ivArrayDotsPager[i].setLayoutParams(params);
ivArrayDotsPager[i].setImageResource(R.drawable.page_indicator_unselected);
//ivArrayDotsPager[i].setAlpha(0.4f);
ivArrayDotsPager[i].setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
view.setAlpha(1);
}
});
llPagerDots.addView(ivArrayDotsPager[i]);
llPagerDots.bringToFront();
}
您可以查看我的图书馆来处理您的请求:https://github.com/tommybuonomo/dotsindicator
在您的 XML 布局中
<com.tbuonomo.viewpagerdotsindicator.DotsIndicator
android:id="@+id/dots_indicator"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
app:dotsColor="@color/colorPrimary"
app:dotsSize="16dp"
app:dotsWidthFactor="3"
/>
在您的 Java 代码中
dotsIndicator = (DotsIndicator) findViewById(R.id.dots_indicator);
viewPager = (ViewPager) findViewById(R.id.view_pager);
adapter = new ViewPagerAdapter();
viewPager.setAdapter(adapter);
dotsIndicator.setViewPager(viewPager);
你的xml
<RelativeLayout
android:id="@+id/rl_speed"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="@+id/ll_dashboard_buttons"
android:layout_below="@+id/ib_menu">
<com.smart.gps.speedometer.app.utils.SmartViewPager
android:id="@+id/view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
</com.smart.gps.speedometer.app.utils.SmartViewPager>
<android.support.design.widget.TabLayout
android:id="@+id/sliding_tabs"
android:layout_alignParentBottom="true"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabBackground="@drawable/tab_selector"
app:tabIndicatorHeight="0dp"
app:tabGravity="center"
/>
创建一个可绘制对象。右击drawable -> new -> Drawable file resource
命名该文件
tab_selector.xml
<item android:drawable="@drawable/selected_tab"
android:state_selected="true"/>
<item android:drawable="@drawable/unselected_tab"/>
现在还有两个 xml 文件。使用受人尊敬的名称再创建两个 xml 文件。这些是选择器指示器和未选择的指示器
selected_tab.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
android:innerRadius="0dp"
android:shape="ring"
android:thickness="4dp"
android:useLevel="false">
<solid android:color="@color/highspeed"/>
</shape>
</item>
</layer-list>
unselected_tab.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
android:innerRadius="0dp"
android:shape="ring"
android:thickness="2dp"
android:useLevel="false">
<solid android:color="@android:color/darker_gray"/>
</shape>
</item>
</layer-list>
将 ViewFlipper 和 viewFlipper_linear_dot_lay(Linearlayout) 放在相同的基线上并遵循下面的
viewFlipper_linear_dot_lay= (LinearLayout) findViewById(R.id.dots_lay);
setupDotsOnViewPager(images_viewFlipper);
for (int i = 0; i < images_viewFlipper.size(); i++) {
//Add Images to ViewFlipper
}
private void setupDotsOnViewPager(ArrayList images_viewFlipper) {
images_linear = new ImageView[images_viewFlipper.size()];
for (int i = 0; i < images_linear.length; i++) {
images_linear[i] = new ImageView(this);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
params.setMargins(5, 0, 5, 0);
params.gravity = Gravity.BOTTOM | Gravity.CENTER;
images_linear[i].setLayoutParams(params);
images_linear[i].setImageResource(R.drawable.unselected);
viewFlipper_linear_dot_lay.addView(images_linear[i]);
viewFlipper_linear_dot_lay.bringToFront();
}
}
并且 OnRight 和 OnLeft 确保放置以下代码
for (int i = 0; i < images_linear.length; i++) {
images_linear[i].setImageResource(R.drawable.unselected);
}
images_linear[viewFlipper.getDisplayedChild()].setImageResource(R.drawable.selected);
<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.LinearLayoutCompat 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="match_parent"
android:orientation="vertical">
<androidx.viewpager.widget.ViewPager
android:id="@+id/vpImage"
android:layout_width="match_parent"
android:layout_height="@dimen/_150sdp" />
<com.google.android.material.tabs.TabLayout
android:id="@+id/tlImage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabBackground="@drawable/selector_product_image"
app:tabGravity="center"
app:tabIndicatorHeight="0dp"
app:tabMaxWidth="12dp"
app:tabRippleColor="@null" />
</androidx.appcompat.widget.LinearLayoutCompat>
ImageAdapter imageAdapter = new ImageAdapter(getActivity(), arrayListSlider);
binding.vpImage.setOffscreenPageLimit(1);
binding.vpImage.setAdapter(imageAdapter);
binding.tlImage.setupWithViewPager(binding.vpImage);
selector_product_image.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/image_selected" android:state_selected="true" />
<item android:drawable="@drawable/image_unselected" />
</selector>
image_selected.xml
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
android:innerRadius="0dp"
android:shape="ring"
android:thickness="4dp"
android:useLevel="false">
<solid android:color="@color/colorAccent" />
</shape>
</item>
</layer-list>
image_unselected.xml
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
android:innerRadius="0dp"
android:shape="ring"
android:thickness="4dp"
android:useLevel="false">
<solid android:color="@color/colorPrimary" />
</shape>
</item>
</layer-list>
ImageAdapter.java
class ImageAdapter extends PagerAdapter {
private Context context;
private ArrayList<ImageModel> arrayList;
private LayoutInflater layoutInflater;
public ImageAdapter(Context context, ArrayList<ImageModel> arrayList) {
this.context = context;
this.arrayList = arrayList;
this.layoutInflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return arrayList.size();
}
@Override
public boolean isViewFromObject(@NonNull View view, @NonNull Object o) {
return view == ((View) o);
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
View view = layoutInflater.inflate(R.layout.row_slider_image, container, false);
AppCompatImageView ivProductImage = view.findViewById(R.id.ivProductImage);
if (!TextUtils.isEmpty(arrayList.get(position).getImage())) {
Glide.with(context)
.load(arrayList.get(position).getImage())
.apply(new RequestOptions().placeholder(R.drawable.no_image).error(R.drawable.no_image))
.into(ivProductImage);
}
container.addView(view);
return view;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
}
row_slider_image.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.LinearLayoutCompat xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<androidx.appcompat.widget.AppCompatImageView
android:id="@+id/ivProductImage"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:adjustViewBounds="true"
android:scaleType="fitXY"
android:src="@drawable/no_image" />
</androidx.appcompat.widget.LinearLayoutCompat>
当你想要与最新的 ViewPager2 和 Kotlin
类似的东西时
一切都是不言自明的,不需要解释!
1.您的 Activity 或片段
val imageList = listOf(
ImageModel(R.drawable.offer1),
ImageModel(R.drawable.splash),
ImageModel(R.drawable.offer1),
ImageModel(R.drawable.splash2)
)
val adapter = HomeOffersAdapter()
adapter.setItem(imageList)
photos_viewpager.adapter = adapter
TabLayoutMediator(tab_layout, photos_viewpager) { tab, position ->
}.attach()
}
2。布局
<RelativeLayout 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="@dimen/dp_200">
<androidx.viewpager2.widget.ViewPager2
android:id="@+id/photos_viewpager"
android:layout_width="match_parent"
android:layout_height="@dimen/dp_200" />
<com.google.android.material.tabs.TabLayout
android:id="@+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_gravity="bottom|center"
app:tabBackground="@drawable/tab_selector"
app:tabGravity="center"
app:tabIndicatorHeight="0dp"
app:tabSelectedTextColor="@android:color/transparent"
app:tabTextColor="@android:color/transparent" />
3。可绘制:tab_selector.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/dot_selected" android:state_selected="true" />
<item android:drawable="@drawable/dot_default" />
4.可绘制:dot_selected.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:innerRadius="0dp"
android:shape="ring"
android:thickness="@dimen/dp_8"
android:useLevel="false">
<solid android:color="@color/colorPrimary" />
<stroke
android:width="@dimen/dp_1"
android:color="@android:color/white" />
5.可绘制:dot_default.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:innerRadius="0dp"
android:shape="ring"
android:thickness="@dimen/dp_8"
android:useLevel="false">
<solid android:color="@android:color/transparent" />
<stroke
android:width="@dimen/dp_1"
android:color="@android:color/white" />
6.适配器
class HomeOffersAdapter : RecyclerView.Adapter<HomeOffersAdapter.HomeOffersViewHolder>() {
private var list: List<ImageModel> = listOf()
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): HomeOffersViewHolder {
return HomeOffersViewHolder(parent)
}
override fun onBindViewHolder(holder: HomeOffersViewHolder, position: Int) {
holder.bind(list[position])
}
fun setItem(list: List<ImageModel>) {
this.list = list
notifyDataSetChanged()
}
override fun getItemCount(): Int = list.size
class HomeOffersViewHolder constructor(itemView: View) : RecyclerView.ViewHolder(itemView) {
constructor(parent: ViewGroup) : this(
LayoutInflater.from(parent.context).inflate(
R.layout.pager_item,
parent, false
)
)
fun bind(imageModel: ImageModel) {
itemView.offerImage.setImageResource(imageModel.image)
}
}
}
7.布局:pager_item.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:orientation="vertical">
<androidx.appcompat.widget.AppCompatImageView
android:id="@+id/offerImage"
android:layout_width="match_parent"
android:layout_height="@dimen/dp_200"
android:adjustViewBounds="true"
android:scaleType="fitXY"
tools:src="@drawable/offer1" />
添加依赖项 > 同步 Gradle
implementation 'com.tbuonomo.andrui:viewpagerdotsindicator:4.1.2'
在您的 java 代码中
dotsIndicator = (DotsIndicator) findViewById(R.id.dots_indicator3);
myViewPagerAdapter = new MyViewPagerAdapter();
viewPager.setAdapter(myViewPagerAdapter);
viewPager.addOnPageChangeListener(viewPagerPageChangeListener);
dotsIndicator.setViewPager(viewPager);
在您的布局中
<com.tbuonomo.viewpagerdotsindicator.SpringDotsIndicator
android:id="@+id/spring_dots_indicator"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:dampingRatio="0.5"
app:dotsColor="@color/material_white"
app:dotsStrokeColor="@color/material_yellow"
app:dotsCornerRadius="2dp"
app:dotsSize="16dp"
app:dotsSpacing="6dp"
app:dotsStrokeWidth="2dp"
app:stiffness="300"
/>
2021,具体怎么做。仅限 ViewPager2。
参考这篇优秀的短文,它有几个问题:
https://medium.com/@adrian.kuta93/android-viewpager-with-dots-indicator-a34c91e59e3a
从 2021 年的正常 Android Studio 默认项目开始,具有合理的新最小值(当前为 24 个)...
一般概念:
制作标准的 TabLayout,但将每个“制表符单元”替换为“一个小点”而不是通常的文本。
在 TabLayout 中,您确实可以使用“tabBackground”替换每个“tab 单元”:
app:tabBackground="@drawable/tab_selector"
所以将以下内容添加到屏幕的 XML 中,它有一个 ViewPager2:
<com.google.android.material.tabs.TabLayout
android:id="@+id/tab_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|center"
android:background="#00FFFFFF"
app:tabBackground="@drawable/tab_selector"
app:tabIndicatorGravity="center"
app:tabIndicatorHeight="0dp"/>
请注意,我们正在用我们自己的 "tab_selector" 替换 TabLayout 中每个 个“选项卡单元”。 =59=].
完全清楚,“tabBackground”指的是单个小“标签单元”,不是整个标签栏系统。
(另外,请注意 tabIndicatorGravity 和 tabIndicatorHeight 这两个技巧确实会摆脱作为通常的“制表符单位”的“框”。)
接下来以显而易见的方式创建三个可绘制对象,tab_selector 和两个不同的点。请参阅上面的文章或此页面上的 100 个示例。
魔法密码:
在您的 onCreate
中有预期的代码...
viewPager = findViewById(R.id.simple_slide_pager);
tab_layout = findViewById(R.id.tab_layout);
viewPager.setAdapter(new ScreenSlidePagerAdapter(this));
最后是使它工作的神奇代码片段。按照上面的:
2021 年最新情况:
TabLayoutMediator tabLayoutMediator =
new TabLayoutMediator(tab_layout, viewPager, true,
new TabLayoutMediator.TabConfigurationStrategy() {
@Override public void onConfigureTab(
@NonNull TabLayout.Tab tab, int position) { }
}
);
tabLayoutMediator.attach();
完成了。
(在 onConfigureTab
中你可以做任何声音效果或任何可能需要的东西。对于更短的语法,请参阅上面@F1iX 的关键评论。)
对于 Viewpager2,按照@RediOne1 建议的相同步骤,在 activity 或片段中使用下面的代码将 tablayout 与 viwpager2
关联起来
val tabLayoutMediator = TabLayoutMediator(binding.tabLayout,binding.offersVp) { _, _ -> }
tabLayoutMediator.attach()
可能你们中的许多人(包括我)在创建带有底部点的 ViewPager
时遇到问题,如下所示:
如何创建这样的 Android ViewPager?
我们只需要:ViewPager, TabLayout 和 2 个用于选定点和默认点的可绘制对象。
首先,我们必须将 TabLayout
添加到我们的屏幕布局中,并将其与 ViewPager
连接起来。我们可以通过两种方式做到这一点:
嵌套在 TabLayout
中 ViewPager
<androidx.viewpager.widget.ViewPager
android:id="@+id/photos_viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.tabs.TabLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</androidx.viewpager.widget.ViewPager>
In this case
TabLayout
will be automatically connected withViewPager
, butTabLayout
will be next toViewPager
, not over it.
分开TabLayout
<androidx.viewpager.widget.ViewPager
android:id="@+id/photos_viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<com.google.android.material.tabs.TabLayout
android:id="@+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
In this case, we can put
TabLayout
anywhere, but we have to connectTabLayout
withViewPager
programmatically
ViewPager pager = (ViewPager) view.findViewById(R.id.photos_viewpager);
PagerAdapter adapter = new PhotosAdapter(getChildFragmentManager(), photosUrl);
pager.setAdapter(adapter);
TabLayout tabLayout = (TabLayout) view.findViewById(R.id.tab_layout);
tabLayout.setupWithViewPager(pager, true);
创建布局后,我们必须准备点。所以我们创建了三个文件:selected_dot.xml
、default_dot.xml
和 tab_selector.xml
.
selected_dot.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
android:innerRadius="0dp"
android:shape="ring"
android:thickness="8dp"
android:useLevel="false">
<solid android:color="@color/colorAccent"/>
</shape>
</item>
</layer-list>
default_dot.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
android:innerRadius="0dp"
android:shape="ring"
android:thickness="8dp"
android:useLevel="false">
<solid android:color="@android:color/darker_gray"/>
</shape>
</item>
</layer-list>
tab_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/selected_dot"
android:state_selected="true"/>
<item android:drawable="@drawable/default_dot"/>
</selector>
现在我们只需要在 XML 布局中向 TabLayout
添加 3 行代码。
app:tabBackground="@drawable/tab_selector"
app:tabGravity="center"
app:tabIndicatorHeight="0dp"
首先创建一个布局,为在您的 View Pager 上显示的点提供一个 LinerLayout
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v4.view.ViewPager
android:id="@+id/view_pager"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<LinearLayout
android:id="@+id/pager_dots"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="10dp"
android:background="@android:color/transparent"
android:gravity="center_horizontal"
android:orientation="horizontal">
</LinearLayout>
</RelativeLayout>
之后创建 2 个可绘制对象
1.未选中的可绘制对象
<?xml version="1.0" encoding="utf-8"?>
<shape android:shape="oval" xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="@android:color/transparent"/>
<size android:width="12dp" android:height="12dp"/>
<stroke android:width="1dp" android:color="#ffffff"/>
</shape>
2。选定的可绘制对象
<?xml version="1.0" encoding="utf-8"?>
<shape android:shape="oval" xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="@android:color/transparent"/>
<size android:width="12dp" android:height="12dp"/>
<stroke android:width="1dp" android:color="#000000"/>
</shape>
之后设置适配器
private LinearLayout llPagerDots;
private ViewPager viewPager;
private ArrayList<String> eventImagesUrl;
private HomeViewPagerAdapter homeViewPagerAdapter;
private ImageView[] ivArrayDotsPager;
public void setUpViewPager() {
viewPager = (ViewPager) findViewById(R.id.view_pager);
llPagerDots = (LinearLayout) findViewById(R.id.pager_dots);
homeViewPagerAdapter = new HomeViewPagerAdapter(mContext, eventImagesUrl);
viewPager.setAdapter(homeViewPagerAdapter);
setupPagerIndidcatorDots();
ivArrayDotsPager[0].setImageResource(R.drawable.page_indicator_selected);
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
for (int i = 0; i < ivArrayDotsPager.length; i++) {
ivArrayDotsPager[i].setImageResource(R.drawable.page_indicator_unselected);
}
ivArrayDotsPager[position].setImageResource(R.drawable.page_indicator_selected);
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
}
创建方法 setupPagerIndidcatorDots() :
private void setupPagerIndidcatorDots() {
ivArrayDotsPager = new ImageView[eventImagesUrl.size()];
for (int i = 0; i < ivArrayDotsPager.length; i++) {
ivArrayDotsPager[i] = new ImageView(getActivity());
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
params.setMargins(5, 0, 5, 0);
ivArrayDotsPager[i].setLayoutParams(params);
ivArrayDotsPager[i].setImageResource(R.drawable.page_indicator_unselected);
//ivArrayDotsPager[i].setAlpha(0.4f);
ivArrayDotsPager[i].setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
view.setAlpha(1);
}
});
llPagerDots.addView(ivArrayDotsPager[i]);
llPagerDots.bringToFront();
}
您可以查看我的图书馆来处理您的请求:https://github.com/tommybuonomo/dotsindicator
在您的 XML 布局中
<com.tbuonomo.viewpagerdotsindicator.DotsIndicator
android:id="@+id/dots_indicator"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
app:dotsColor="@color/colorPrimary"
app:dotsSize="16dp"
app:dotsWidthFactor="3"
/>
在您的 Java 代码中
dotsIndicator = (DotsIndicator) findViewById(R.id.dots_indicator);
viewPager = (ViewPager) findViewById(R.id.view_pager);
adapter = new ViewPagerAdapter();
viewPager.setAdapter(adapter);
dotsIndicator.setViewPager(viewPager);
你的xml
<RelativeLayout
android:id="@+id/rl_speed"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="@+id/ll_dashboard_buttons"
android:layout_below="@+id/ib_menu">
<com.smart.gps.speedometer.app.utils.SmartViewPager
android:id="@+id/view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
</com.smart.gps.speedometer.app.utils.SmartViewPager>
<android.support.design.widget.TabLayout
android:id="@+id/sliding_tabs"
android:layout_alignParentBottom="true"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabBackground="@drawable/tab_selector"
app:tabIndicatorHeight="0dp"
app:tabGravity="center"
/>
创建一个可绘制对象。右击drawable -> new -> Drawable file resource 命名该文件
tab_selector.xml
<item android:drawable="@drawable/selected_tab"
android:state_selected="true"/>
<item android:drawable="@drawable/unselected_tab"/>
现在还有两个 xml 文件。使用受人尊敬的名称再创建两个 xml 文件。这些是选择器指示器和未选择的指示器
selected_tab.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
android:innerRadius="0dp"
android:shape="ring"
android:thickness="4dp"
android:useLevel="false">
<solid android:color="@color/highspeed"/>
</shape>
</item>
</layer-list>
unselected_tab.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
android:innerRadius="0dp"
android:shape="ring"
android:thickness="2dp"
android:useLevel="false">
<solid android:color="@android:color/darker_gray"/>
</shape>
</item>
</layer-list>
将 ViewFlipper 和 viewFlipper_linear_dot_lay(Linearlayout) 放在相同的基线上并遵循下面的
viewFlipper_linear_dot_lay= (LinearLayout) findViewById(R.id.dots_lay);
setupDotsOnViewPager(images_viewFlipper);
for (int i = 0; i < images_viewFlipper.size(); i++) {
//Add Images to ViewFlipper
}
private void setupDotsOnViewPager(ArrayList images_viewFlipper) {
images_linear = new ImageView[images_viewFlipper.size()];
for (int i = 0; i < images_linear.length; i++) {
images_linear[i] = new ImageView(this);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
params.setMargins(5, 0, 5, 0);
params.gravity = Gravity.BOTTOM | Gravity.CENTER;
images_linear[i].setLayoutParams(params);
images_linear[i].setImageResource(R.drawable.unselected);
viewFlipper_linear_dot_lay.addView(images_linear[i]);
viewFlipper_linear_dot_lay.bringToFront();
}
}
并且 OnRight 和 OnLeft 确保放置以下代码
for (int i = 0; i < images_linear.length; i++) {
images_linear[i].setImageResource(R.drawable.unselected);
}
images_linear[viewFlipper.getDisplayedChild()].setImageResource(R.drawable.selected);
<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.LinearLayoutCompat 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="match_parent"
android:orientation="vertical">
<androidx.viewpager.widget.ViewPager
android:id="@+id/vpImage"
android:layout_width="match_parent"
android:layout_height="@dimen/_150sdp" />
<com.google.android.material.tabs.TabLayout
android:id="@+id/tlImage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabBackground="@drawable/selector_product_image"
app:tabGravity="center"
app:tabIndicatorHeight="0dp"
app:tabMaxWidth="12dp"
app:tabRippleColor="@null" />
</androidx.appcompat.widget.LinearLayoutCompat>
ImageAdapter imageAdapter = new ImageAdapter(getActivity(), arrayListSlider);
binding.vpImage.setOffscreenPageLimit(1);
binding.vpImage.setAdapter(imageAdapter);
binding.tlImage.setupWithViewPager(binding.vpImage);
selector_product_image.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/image_selected" android:state_selected="true" />
<item android:drawable="@drawable/image_unselected" />
</selector>
image_selected.xml
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
android:innerRadius="0dp"
android:shape="ring"
android:thickness="4dp"
android:useLevel="false">
<solid android:color="@color/colorAccent" />
</shape>
</item>
</layer-list>
image_unselected.xml
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
android:innerRadius="0dp"
android:shape="ring"
android:thickness="4dp"
android:useLevel="false">
<solid android:color="@color/colorPrimary" />
</shape>
</item>
</layer-list>
ImageAdapter.java
class ImageAdapter extends PagerAdapter {
private Context context;
private ArrayList<ImageModel> arrayList;
private LayoutInflater layoutInflater;
public ImageAdapter(Context context, ArrayList<ImageModel> arrayList) {
this.context = context;
this.arrayList = arrayList;
this.layoutInflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return arrayList.size();
}
@Override
public boolean isViewFromObject(@NonNull View view, @NonNull Object o) {
return view == ((View) o);
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
View view = layoutInflater.inflate(R.layout.row_slider_image, container, false);
AppCompatImageView ivProductImage = view.findViewById(R.id.ivProductImage);
if (!TextUtils.isEmpty(arrayList.get(position).getImage())) {
Glide.with(context)
.load(arrayList.get(position).getImage())
.apply(new RequestOptions().placeholder(R.drawable.no_image).error(R.drawable.no_image))
.into(ivProductImage);
}
container.addView(view);
return view;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
}
row_slider_image.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.LinearLayoutCompat xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<androidx.appcompat.widget.AppCompatImageView
android:id="@+id/ivProductImage"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:adjustViewBounds="true"
android:scaleType="fitXY"
android:src="@drawable/no_image" />
</androidx.appcompat.widget.LinearLayoutCompat>
当你想要与最新的 ViewPager2 和 Kotlin
类似的东西时一切都是不言自明的,不需要解释!
1.您的 Activity 或片段
val imageList = listOf(
ImageModel(R.drawable.offer1),
ImageModel(R.drawable.splash),
ImageModel(R.drawable.offer1),
ImageModel(R.drawable.splash2)
)
val adapter = HomeOffersAdapter()
adapter.setItem(imageList)
photos_viewpager.adapter = adapter
TabLayoutMediator(tab_layout, photos_viewpager) { tab, position ->
}.attach()
}
2。布局
<RelativeLayout 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="@dimen/dp_200">
<androidx.viewpager2.widget.ViewPager2
android:id="@+id/photos_viewpager"
android:layout_width="match_parent"
android:layout_height="@dimen/dp_200" />
<com.google.android.material.tabs.TabLayout
android:id="@+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_gravity="bottom|center"
app:tabBackground="@drawable/tab_selector"
app:tabGravity="center"
app:tabIndicatorHeight="0dp"
app:tabSelectedTextColor="@android:color/transparent"
app:tabTextColor="@android:color/transparent" />
3。可绘制:tab_selector.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/dot_selected" android:state_selected="true" />
<item android:drawable="@drawable/dot_default" />
4.可绘制:dot_selected.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:innerRadius="0dp"
android:shape="ring"
android:thickness="@dimen/dp_8"
android:useLevel="false">
<solid android:color="@color/colorPrimary" />
<stroke
android:width="@dimen/dp_1"
android:color="@android:color/white" />
5.可绘制:dot_default.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:innerRadius="0dp"
android:shape="ring"
android:thickness="@dimen/dp_8"
android:useLevel="false">
<solid android:color="@android:color/transparent" />
<stroke
android:width="@dimen/dp_1"
android:color="@android:color/white" />
6.适配器
class HomeOffersAdapter : RecyclerView.Adapter<HomeOffersAdapter.HomeOffersViewHolder>() {
private var list: List<ImageModel> = listOf()
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): HomeOffersViewHolder {
return HomeOffersViewHolder(parent)
}
override fun onBindViewHolder(holder: HomeOffersViewHolder, position: Int) {
holder.bind(list[position])
}
fun setItem(list: List<ImageModel>) {
this.list = list
notifyDataSetChanged()
}
override fun getItemCount(): Int = list.size
class HomeOffersViewHolder constructor(itemView: View) : RecyclerView.ViewHolder(itemView) {
constructor(parent: ViewGroup) : this(
LayoutInflater.from(parent.context).inflate(
R.layout.pager_item,
parent, false
)
)
fun bind(imageModel: ImageModel) {
itemView.offerImage.setImageResource(imageModel.image)
}
}
}
7.布局:pager_item.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:orientation="vertical">
<androidx.appcompat.widget.AppCompatImageView
android:id="@+id/offerImage"
android:layout_width="match_parent"
android:layout_height="@dimen/dp_200"
android:adjustViewBounds="true"
android:scaleType="fitXY"
tools:src="@drawable/offer1" />
添加依赖项 > 同步 Gradle
implementation 'com.tbuonomo.andrui:viewpagerdotsindicator:4.1.2'
在您的 java 代码中
dotsIndicator = (DotsIndicator) findViewById(R.id.dots_indicator3);
myViewPagerAdapter = new MyViewPagerAdapter();
viewPager.setAdapter(myViewPagerAdapter);
viewPager.addOnPageChangeListener(viewPagerPageChangeListener);
dotsIndicator.setViewPager(viewPager);
在您的布局中
<com.tbuonomo.viewpagerdotsindicator.SpringDotsIndicator
android:id="@+id/spring_dots_indicator"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:dampingRatio="0.5"
app:dotsColor="@color/material_white"
app:dotsStrokeColor="@color/material_yellow"
app:dotsCornerRadius="2dp"
app:dotsSize="16dp"
app:dotsSpacing="6dp"
app:dotsStrokeWidth="2dp"
app:stiffness="300"
/>
2021,具体怎么做。仅限 ViewPager2。
参考这篇优秀的短文,它有几个问题:
https://medium.com/@adrian.kuta93/android-viewpager-with-dots-indicator-a34c91e59e3a
从 2021 年的正常 Android Studio 默认项目开始,具有合理的新最小值(当前为 24 个)...
一般概念:
制作标准的 TabLayout,但将每个“制表符单元”替换为“一个小点”而不是通常的文本。
在 TabLayout 中,您确实可以使用“tabBackground”替换每个“tab 单元”:
app:tabBackground="@drawable/tab_selector"
所以将以下内容添加到屏幕的 XML 中,它有一个 ViewPager2:
<com.google.android.material.tabs.TabLayout
android:id="@+id/tab_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|center"
android:background="#00FFFFFF"
app:tabBackground="@drawable/tab_selector"
app:tabIndicatorGravity="center"
app:tabIndicatorHeight="0dp"/>
请注意,我们正在用我们自己的 "tab_selector" 替换 TabLayout 中每个 个“选项卡单元”。 =59=].
完全清楚,“tabBackground”指的是单个小“标签单元”,不是整个标签栏系统。
(另外,请注意 tabIndicatorGravity 和 tabIndicatorHeight 这两个技巧确实会摆脱作为通常的“制表符单位”的“框”。)
接下来以显而易见的方式创建三个可绘制对象,tab_selector 和两个不同的点。请参阅上面的文章或此页面上的 100 个示例。
魔法密码:
在您的 onCreate
中有预期的代码...
viewPager = findViewById(R.id.simple_slide_pager);
tab_layout = findViewById(R.id.tab_layout);
viewPager.setAdapter(new ScreenSlidePagerAdapter(this));
最后是使它工作的神奇代码片段。按照上面的:
2021 年最新情况:
TabLayoutMediator tabLayoutMediator =
new TabLayoutMediator(tab_layout, viewPager, true,
new TabLayoutMediator.TabConfigurationStrategy() {
@Override public void onConfigureTab(
@NonNull TabLayout.Tab tab, int position) { }
}
);
tabLayoutMediator.attach();
完成了。
(在 onConfigureTab
中你可以做任何声音效果或任何可能需要的东西。对于更短的语法,请参阅上面@F1iX 的关键评论。)
对于 Viewpager2,按照@RediOne1 建议的相同步骤,在 activity 或片段中使用下面的代码将 tablayout 与 viwpager2
关联起来 val tabLayoutMediator = TabLayoutMediator(binding.tabLayout,binding.offersVp) { _, _ -> }
tabLayoutMediator.attach()