Android 如何在ViewPager2页面之间自动切换
如何自动移动ViewPager2页面?好的,下面是一个示例……希望对您有所帮助 下面我给你举一个例子,说明如何使用viewpager2自动更改片段 依赖关系:Android 如何在ViewPager2页面之间自动切换,android,android-viewpager,androidx,android-viewpager2,Android,Android Viewpager,Androidx,Android Viewpager2,如何自动移动ViewPager2页面?好的,下面是一个示例……希望对您有所帮助 下面我给你举一个例子,说明如何使用viewpager2自动更改片段 依赖关系: <androidx.viewpager2.widget.ViewPager2 android:id="@+id/view_pager2" android:layout_width="match_parent" android:layout_height="match_parent"/&
<androidx.viewpager2.widget.ViewPager2
android:id="@+id/view_pager2"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
main活动
implementation 'com.google.android.material:material:1.1.0-alpha08'
implementation 'androidx.viewpager2:viewpager2:1.0.0-beta02'
public类MainActivity扩展了AppCompatActivity{
int-ci=0;
java.util.Timer;
ViewPager2 myViewPager2;
ViewPagerAdapter myAdapter;
私有ArrayList ArrayList=新ArrayList();
@凌驾
创建时受保护的void(@Nullable Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myViewPager2=findViewById(R.id.view\u pager);
//在ViewPagerFragmentAdapter类中添加片段
add(newfirstfragment());
add(新的SecondFragment());
add(新的ThirdFragment());
myAdapter=new ViewPagerAdapter(getSupportFragmentManager(),getLifecycle());
//在ViewPage2中设置方向
myViewPager2.setOrientation(ViewPager2.ORIENTATION\u水平);
myViewPager2.setAdapter(myAdapter);
myViewPager2.setPageTransformer(新的MarginPageTransformer(1500));
定时器=新定时器();
timer.schedule(新TimerTask(){
@凌驾
公开募捐{
myViewPager2.post(新的Runnable(){
@凌驾
公开募捐{
Log.d(“viewPager”,即“+ci”);
myViewPager2.setCurrentItem(ci%7);
ci++;
}
});
}
},10003000);//更改3秒您可以根据需要更改
}}
活动主目录
public class MainActivity extends AppCompatActivity {
int ci=0;
java.util.Timer timer;
ViewPager2 myViewPager2;
ViewPagerAdapter myAdapter;
private ArrayList<Fragment> arrayList = new ArrayList<>();
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myViewPager2 = findViewById(R.id.view_pager);
// add Fragments in your ViewPagerFragmentAdapter class
arrayList.add(new FirstFragment());
arrayList.add(new SecondFragment());
arrayList.add(new ThirdFragment());
myAdapter = new ViewPagerAdapter(getSupportFragmentManager(), getLifecycle());
// set Orientation in your ViewPager2
myViewPager2.setOrientation(ViewPager2.ORIENTATION_HORIZONTAL);
myViewPager2.setAdapter(myAdapter);
myViewPager2.setPageTransformer(new MarginPageTransformer(1500));
timer=new Timer();
timer.schedule(new TimerTask() {
@Override
public void run() {
myViewPager2.post(new Runnable() {
@Override
public void run() {
Log.d("viewPager",""+ci);
myViewPager2.setCurrentItem(ci%7);
ci++;
}
});
}
},1000,3000);//changes 3 second you can change as per requirement
}}
这是适配器
<?xml version="1.0" encoding="utf-8"?>
<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:orientation="vertical"
tools:context=".MainActivity">
<androidx.viewpager2.widget.ViewPager2
android:id="@+id/view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
公共类ViewPagerAdapter扩展了FragmentStateAdapter{
私有ArrayList ArrayList=新ArrayList();
public ViewPagerAdapter(@NonNull FragmentManager FragmentManager,@NonNull Lifecycle Lifecycle){
超级(碎片管理器,生命周期);
}
@非空
@凌驾
公共片段createFragment(int位置){
开关(位置){
案例0:
返回新的FirstFragment();
案例1:
返回新的SecondFragment();
案例2:
返回新的第三个片段();
}
返回null;
}
@凌驾
public int getItemCount(){
返回3;
}}
最后但并非最不重要的一点是,您必须添加诸如firstFragment、second等片段…这是否回答了您的问题?不,使用新的ViewPager2不是这样,需要处理用户touch@BincyBaby意味着您需要两种?用户触摸+自动?@bincybeaby,但我的代码同时适用于用户触摸刷卡和自动刷卡
public class ViewPagerAdapter extends FragmentStateAdapter {
private ArrayList<Fragment> arrayList = new ArrayList<>();
public ViewPagerAdapter(@NonNull FragmentManager fragmentManager, @NonNull Lifecycle lifecycle) {
super(fragmentManager, lifecycle);
}
@NonNull
@Override
public Fragment createFragment(int position) {
switch (position) {
case 0:
return new FirstFragment();
case 1:
return new SecondFragment();
case 2:
return new ThirdFragment();
}
return null;
}
@Override
public int getItemCount() {
return 3;
}}