setAdapter() сбой приложения

Question

Когда я называю .notifyDataSetChanged() в моем конструкторе после того, как я установил мой ArrayList мое приложение по-прежнему происходит сбой, то же самое, когда я называю его, прежде чем я называю .setAdapter, это беспокоило меня для часов, хотел бы любой помощи, спасибо!

public class CustomSwipeAdapter extends PagerAdapter { 

private ArrayList<String> image_resources = new ArrayList<>(); 
private Context mContext; 
private LayoutInflater mLayoutInflater; 
private ImageLoader mImageLoader; 

public CustomSwipeAdapter(Context context, ArrayList<String> images){ 
    this.mContext = context; 
    this.image_resources = images; 
} 

@Override 
public int getCount() { 
    return image_resources.size(); 
} 

@Override 
public boolean isViewFromObject(View view, Object object) { 
    return (view == (LinearLayout)object); 
} 

@Override 
public Object instantiateItem(ViewGroup container, int position) { 
    mLayoutInflater = (LayoutInflater) mContext.getSystemService(mContext.LAYOUT_INFLATER_SERVICE); 
    View item_view = mLayoutInflater.inflate(R.layout.swipe_layout, container, false); 

    final ImageView imageView = (ImageView) item_view.findViewById(R.id.imageView); 

    if (image_resources.get(position) != null || !image_resources.get(position).isEmpty()) { 

     mImageLoader.get(image_resources.get(position), new ImageLoader.ImageListener() { 
      @Override 
      public void onResponse(ImageLoader.ImageContainer response, boolean isImmediate) { 
       imageView.setImageBitmap(response.getBitmap()); 
      } 

      @Override 
      public void onErrorResponse(VolleyError error) { 
       imageView.setBackgroundColor(Color.CYAN); 
      } 
     }); 
    } 

    container.addView(item_view); 

    return item_view; 
} 

@Override 
public void destroyItem(ViewGroup container, int position, Object object) { 
    container.removeView((LinearLayout) object); 
    super.destroyItem(container, position, object); 
} 
} 

Где я могу установить адаптер (в моей деятельности в OnCreate()), это наиболее основной деятельности

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_page); 
    mViewPager = (ViewPager) findViewById(R.id.view_pager); 

    mVolleySingleton = VolleySingleton.getInstance(); 
    mRequestQueue = mVolleySingleton.getRequestQueue(); 
    sendAPIRequest(); 

    //after you get the images 
    mCustomSwipeAdapter = new CustomSwipeAdapter(this, images); 
    mViewPager.setAdapter(mCustomSwipeAdapter); 

} 

Трассировка стека:

java.lang.IllegalStateException: The application's PagerAdapter changed the adapter's contents without calling PagerAdapter#notifyDataSetChanged! Expected adapter item count: 0, found: 4 Pager id: sobmad.com.gamingreminder:id/view_pager Pager class: class android.support.v4.view.ViewPager Problematic adapter: class sobmad.com.gamingreminder.GamePage.CustomSwipeAdapter 
     at android.support.v4.view.ViewPager.populate(ViewPager.java:967) 
     at android.support.v4.view.ViewPager.populate(ViewPager.java:919) 
     at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1441) 
     at android.view.View.measure(View.java:15848) 
     at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:728) 
     at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:477) 
     at android.view.View.measure(View.java:15848) 
     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012) 
     at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
     at android.view.View.measure(View.java:15848) 
     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012) 
     at android.support.v7.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:453) 
     at android.view.View.measure(View.java:15848) 
     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012) 
     at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
     at android.view.View.measure(View.java:15848) 
     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012) 
     at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404) 
     at android.widget.LinearLayout.measureVertical(LinearLayout.java:695) 
     at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) 
     at android.view.View.measure(View.java:15848) 
     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012) 
     at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
     at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2189) 
     at android.view.View.measure(View.java:15848) 
     at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1905) 
     at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1104) 
     at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1284) 
     at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1004) 
     at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5481) 
     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749) 
     at android.view.Choreographer.doCallbacks(Choreographer.java:562) 
     at android.view.Choreographer.doFrame(Choreographer.java:532) 
     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735) 
     at android.os.Handler.handleCallback(Handler.java:730) 
     at android.os.Handler.dispatchMessage(Handler.java:92) 
     at android.os.Looper.loop(Looper.java:137) 
     at android.app.ActivityThread.main(ActivityThread.java:5103) 
     at java.lang.reflect.Method.invokeNative(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:525) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
     at dalvik.system.NativeStart.main(Native Method) 

Answer 1

mCustomSwipeAdapter = new CustomSwipeAdapter(this, images); 
mViewPager.setAdapter(mCustomSwipeAdapter); 

mCustomSwipeAdapter.notifyDataSetChange() //Add this line in your activity