Android ViewPager

Question

Я хочу сделать мероприятие. когда я нажимаю кнопку 3, я хочу одновременно перемещать ViewPager1 (положение 0-> 1) также ViewPager2 (позиция 0-> 1). вот мой код

main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:id="@+id/LinearLayout2" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" 
    tools:context=".MainActivity" > 

    <LinearLayout 
     android:layout_width="match_parent" 
     android:layout_height="0dp" 
     android:layout_weight="1" 
     android:orientation="vertical" > 

     <android.support.v4.view.ViewPager 
      android:id="@+id/viewpager_a" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" > 
     </android.support.v4.view.ViewPager> 
    </LinearLayout> 

    <LinearLayout 
     android:layout_width="match_parent" 
     android:layout_height="0dp" 
     android:layout_weight="1" 
     android:orientation="vertical" > 

     <android.support.v4.view.ViewPager 
      android:id="@+id/viewpager_b" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" > 
     </android.support.v4.view.ViewPager> 
    </LinearLayout> 

</LinearLayout> 

viewpager_a1.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" > 

    <TextView 
     android:id="@+id/textView1" 
     android:layout_width="match_parent" 
     android:layout_height="0dp" 
     android:layout_weight="1" 
     android:gravity="center" 
     android:text="ViewPager1(Position 0)" /> 

    <Button 
     android:id="@+id/button1" 
     android:layout_width="match_parent" 
     android:layout_height="0dp" 
     android:layout_weight="1" 
     android:text="Button1" /> 

</LinearLayout> 

viewpager_a2.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" > 

    <TextView 
     android:id="@+id/textView1" 
     android:layout_width="match_parent" 
     android:layout_height="0dp" 
     android:layout_weight="1" 
     android:gravity="center" 
     android:text="ViewPager1(Position 1)" /> 

    <Button 
     android:id="@+id/button2" 
     android:layout_width="match_parent" 
     android:layout_height="0dp" 
     android:layout_weight="1" 
     android:text="Button2" /> 

</LinearLayout> 

viewpager_b1.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" > 

    <TextView 
     android:id="@+id/textView1" 
     android:layout_width="match_parent" 
     android:layout_height="0dp" 
     android:layout_weight="1" 
     android:gravity="center" 
     android:text="ViewPager2(Position 0)" /> 

    <Button 
     android:id="@+id/button3" 
     android:layout_width="match_parent" 
     android:layout_height="0dp" 
     android:layout_weight="1" 
     android:text="Button3" /> 

</LinearLayout> 

viewpager_b2.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" > 

    <TextView 
     android:id="@+id/textView1" 
     android:layout_width="match_parent" 
     android:layout_height="0dp" 
     android:layout_weight="1" 
     android:gravity="center" 
     android:text="ViewPager2(Position 1)" /> 

    <Button 
     android:id="@+id/button4" 
     android:layout_width="match_parent" 
     android:layout_height="0dp" 
     android:layout_weight="1" 
     android:text="Button4" /> 

</LinearLayout> 

main.java

public class MainActivity extends Activity { 

    private ViewPager viewpagerA; 
    private ViewPager viewpagerB; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     viewpagerA =(ViewPager)findViewById(R.id.viewpager_a); 
     viewpagerA.setAdapter(new AdpaterA(getApplicationContext(),viewpagerA)); 

     viewpagerB =(ViewPager)findViewById(R.id.viewpager_b); 
     viewpagerB.setAdapter(new AdpaterB(getApplicationContext(),viewpagerB)); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 

     getMenuInflater().inflate(R.menu.main, menu); 
     return true; 
    } 

} 

ViewPagerApdaterA.java

public class AdpaterA extends PagerAdapter { 

    public LayoutInflater mInflater; 
    public Context mContext; 
    public ViewPager mViewPager; 

    public AdpaterA(Context c, ViewPager pager) { 

     super(); 
     mContext = c; 
     mInflater = LayoutInflater.from(c); 
     mViewPager=pager; 
     mViewPager.setAdapter(this);   
    } 

    @Override 
    public int getCount() { 
     // TODO Auto-generated method stub 
     return 2; 
    } 

    @Override 
    public boolean isViewFromObject(View pager, Object obj) { 

     return pager == obj; 
    } 

    @Override 
    public Object instantiateItem(View pager, int position) { 
     View v = null; 
     if (position == 0) { 
      v = mInflater.inflate(R.layout.viewpager_a1, null); 
      Button button1 = (Button) v.findViewById(R.id.button1); 
      button1.setOnClickListener(mPagerClickListener); 
     } else if (position == 1) { 
      v = mInflater.inflate(R.layout.viewpager_a2, null); 
      Button button2 = (Button) v.findViewById(R.id.button2); 
      button2.setOnClickListener(mPagerClickListener); 
     } 
     ((ViewPager) pager).addView(v, 0); 

     return v; 
    } 

    private View.OnClickListener mPagerClickListener = new View.OnClickListener() { 

     @Override 
     public void onClick(View v) { 

      switch (v.getId()){ 
      case R.id.button1: 
       changeviewpager(1); 
       Toast.makeText(mContext, "Button 1", Toast.LENGTH_SHORT).show(); 
       break; 
      case R.id.button2: 
       changeviewpager(2); 
       Toast.makeText(mContext, "Button 2", Toast.LENGTH_SHORT).show(); 
       break; 
      } 
     } 
    }; 

    public void changeviewpager(int type) { 

     if(type==1){ 
      mViewPager.setCurrentItem(1); 
     }else if(type==2){ 
      mViewPager.setCurrentItem(0); 
     }  
    } 

    @Override 
    public void destroyItem(View pager, int position, Object view) { 
     ((ViewPager) pager).removeView((View) view); 
    } 

    @Override 
    public void restoreState(Parcelable arg0, ClassLoader arg1) { 
    } 

    @Override 
    public Parcelable saveState() { 
     return null; 
    } 

    @Override 
    public void startUpdate(View arg0) { 
    } 

    @Override 
    public void finishUpdate(View arg0) { 
    } 
} 

ViewPagerAdpaterB.java

public class AdpaterB extends PagerAdapter { 

    public LayoutInflater mInflater; 
    public Context mContext; 
    public ViewPager mViewPager; 

    public AdpaterB(Context c, ViewPager pager) { 

     super(); 
     mContext = c; 
     mInflater = LayoutInflater.from(c); 
     mViewPager=pager; 
     mViewPager.setAdapter(this);  
    } 

    @Override 
    public int getCount() { 

     return 2; 
    } 

    @Override 
    public boolean isViewFromObject(View pager, Object obj) { 

     return pager == obj; 
    } 

    @Override 
    public Object instantiateItem(View pager, int position) { 
     View v = null; 
     if (position == 0) { 
      v = mInflater.inflate(R.layout.viewpager_b1, null); 
      Button button3 = (Button) v.findViewById(R.id.button3); 
      button3.setOnClickListener(mPagerClickListener); 
     } else if (position == 1) { 
      v = mInflater.inflate(R.layout.viewpager_b2, null); 
      Button button4 = (Button) v.findViewById(R.id.button4); 
      button4.setOnClickListener(mPagerClickListener); 
     } 
     ((ViewPager) pager).addView(v, 0); 

     return v; 
    } 

    private View.OnClickListener mPagerClickListener = new View.OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      switch (v.getId()){ 
      case R.id.button3: 
       changeviewpager(1); 
       Toast.makeText(mContext, "Button 3", Toast.LENGTH_SHORT).show(); 
       break; 
      case R.id.button4: 
       changeviewpager(2); 
       Toast.makeText(mContext, "Button 4", Toast.LENGTH_SHORT).show(); 
       break; 
      } 
     } 
    }; 

    public void changeviewpager(int type) { 

     if(type==1){ 
      mViewPager.setCurrentItem(1); 
     }else if(type==2){ 
      mViewPager.setCurrentItem(0); 
     }  
    } 

    @Override 
    public void destroyItem(View pager, int position, Object view) { 
     ((ViewPager) pager).removeView((View) view); 
    } 

    @Override 
    public void restoreState(Parcelable arg0, ClassLoader arg1) { 
    } 

    @Override 
    public Parcelable saveState() { 
     return null; 
    } 

    @Override 
    public void startUpdate(View arg0) { 
    } 

    @Override 
    public void finishUpdate(View arg0) { 
    } 
} 

отсюда, нет ошибок. но я не знаю, как добавить код .... при нажатии кнопки3, viewpager2 перемещается из положения '0' в '1' , а также viewpager1 перемещается из положения '0' в '1'. помочь мне ~

Answer 1

Вы можете использовать

//change 1 to whatever page you want 
viewPager.setCurrentItem(1, true); 

изменить на произвольную страницу. Второй параметр - smoothScroll, если вы установите его значение true, пейджер будет плавно прокручиваться до новой позиции, если он установлен в false, он просто перескакивает с одного на другой.

See the docs for ViewPager to learn more.