Android View Pager Gallery不会在第一时间显示数据

我正在为我的应用程序创建一个简单的ViewPager图库。这是我迄今为止实现的代码。Android View Pager Gallery不会在第一时间显示数据

这是我的xml文件

<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="com.example.newgallery.MainActivity" > 

    <android.support.v4.view.ViewPager 
     android:id="@+id/view_pager" 
     android:layout_width="match_parent" 
     android:layout_height="240dp" /> 

</LinearLayout>

，这是我的java文件

public class MainActivity extends Activity { 

    private Bitmap[] IMAGES; 
    Bitmap bit1,bit2,bit3,bit4; 
    String getid, url1,url2,url3,url4; 

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

     getid = "14"; 
     url1 = "http://example.com/dom/uploads/"+getid+"/img1.jpg"; 
     url2 = "http://example.com/dom/uploads/"+getid+"/img2.jpg"; 
     url3 = "http://example.com/dom/uploads/"+getid+"/img3.jpg"; 
     url4 = "http://example.com/dom/uploads/"+getid+"/img4.jpg"; 

     bit1 = LoadImages(url1); 
     bit2 = LoadImages(url2); 
     bit3 = LoadImages(url3); 
     bit4 = LoadImages(url4); 

     IMAGES = new Bitmap[]{bit1,bit2,bit3,bit4}; 


     ViewPager viewPager = (ViewPager) findViewById(R.id.view_pager); 
     ImageAdapter adapter = new ImageAdapter(); 
     viewPager.setAdapter(adapter); 




    } 

    class ImageAdapter extends PagerAdapter { 

     @Override 
     public int getCount() { 
      return IMAGES.length; 
     } 

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

     @Override 
     public Object instantiateItem(ViewGroup container, int position) { 
      ImageView imageView = new ImageView(getApplicationContext()); 
      imageView.setImageBitmap(IMAGES[position]); 
      ((ViewPager) container).addView(imageView, 0); 
      return imageView; 
     } 

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

    Bitmap result; 
    public Bitmap LoadImages(String url){ 
     ImageLoader imageLoader = AppController.getInstance().getImageLoader(); 
     imageLoader.get(url, new ImageListener() { 

        @Override 
        public void onErrorResponse(VolleyError error) { 
         Bitmap drawimg = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher); 
         result = drawimg; 
        } 

        @Override 
        public void onResponse(ImageContainer response, boolean arg1) { 
         if (response.getBitmap() != null) { 
          result = response.getBitmap(); 
         } 
        } 
       }); 
     return result; 
    } 
}

，这里是我的logcat的。 所有的链接工作正常。在这里，我改变了原来的域名example.com

09-02 19:36:35.568: D/Volley(630): [76] BasicNetwork.logSlowRequests: HTTP response for request=<[ ] http://example.com/dom/uploads/14/img2.jpg 0x90e75755 LOW 2> [lifetime=3027], [size=107746], [rc=200], [retryCount=0] 
09-02 19:36:35.568: D/Volley(630): [74] BasicNetwork.logSlowRequests: HTTP response for request=<[ ] http://example.com/dom/uploads/14/img1.jpg 0x90e75755 LOW 1> [lifetime=3075], [size=89388], [rc=200], [retryCount=0] 
09-02 19:36:35.798: D/dalvikvm(630): GC_FOR_ALLOC freed 281K, 4% free 19781K/20487K, paused 84ms, total 85ms 
09-02 19:36:35.808: I/dalvikvm-heap(630): Grow heap (frag case) to 20.002MB for 544016-byte allocation 
09-02 19:36:35.918: D/dalvikvm(630): GC_FOR_ALLOC freed <1K, 4% free 20312K/21063K, paused 101ms, total 101ms 
09-02 19:36:36.028: D/dalvikvm(630): GC_CONCURRENT freed <1K, 4% free 20312K/21063K, paused 30ms+22ms, total 100ms 
09-02 19:36:36.108: D/Volley(630): [1] Request.finish: 4019 ms: [ ] http://example.com/dom/uploads/14/img3.jpg 0x90e75755 LOW 3 
09-02 19:36:36.218: D/dalvikvm(630): GC_FOR_ALLOC freed 18K, 4% free 20313K/21063K, paused 69ms, total 69ms 
09-02 19:36:36.228: I/dalvikvm-heap(630): Grow heap (frag case) to 20.522MB for 544016-byte allocation 
09-02 19:36:36.318: D/dalvikvm(630): GC_FOR_ALLOC freed 0K, 4% free 20845K/21639K, paused 84ms, total 84ms 
09-02 19:36:36.428: D/dalvikvm(630): GC_CONCURRENT freed 1K, 4% free 20845K/21639K, paused 30ms+9ms, total 98ms 
09-02 19:36:36.568: D/Volley(630): [1] Request.finish: 4472 ms: [ ] http://example.com/dom/uploads/14/img4.jpg 0x90e75755 LOW 4 
09-02 19:36:36.638: D/dalvikvm(630): GC_FOR_ALLOC freed 20K, 4% free 20845K/21639K, paused 63ms, total 64ms 
09-02 19:36:36.648: I/dalvikvm-heap(630): Grow heap (frag case) to 21.041MB for 544016-byte allocation 
09-02 19:36:36.728: D/dalvikvm(630): GC_FOR_ALLOC freed 0K, 4% free 21376K/22215K, paused 77ms, total 77ms 
09-02 19:36:36.908: D/Volley(630): [1] Request.finish: 4813 ms: [ ] http://example.com/dom/uploads/14/img2.jpg 0x90e75755 LOW 2 
09-02 19:36:36.978: D/Volley(630): [1] Request.finish: 4897 ms: [ ] http://example.com/dom/uploads/14/img1.jpg 0x90e75755 LOW 1

所以我的问题是，当我试图运行我的应用程序，第一次它不会加载图像。我得到4个白页。但如果我退出程序并再次运行它，我可以看到所有图像都加载得很好。

enter image description here