视频缩略图

Question

我要显示视频缩略图中的GridView

private void initVideosId() { 
     try 
     { 
      //Here we set up a string array of the thumbnail ID column we want to get back 
      String [] proj={_ID}; 
      // Now we create the cursor pointing to the external thumbnail store 
      _cursor = managedQuery(_contentUri, 
        proj, // Which columns to return 
        null,  // WHERE clause; which rows to return (all rows) 
        null,  // WHERE clause selection arguments (none) 
        null); // Order-by clause (ascending by name) 
      int count= _cursor.getCount(); 
      if(count==0) 
       showToast("meiyou"); 
      // We now get the column index of the thumbnail id 
      _columnIndex = _cursor.getColumnIndex(_ID); 
      //initialize 
      _videosId = new int[count]; 
      //move position to first element 
      _cursor.moveToFirst();   
      for(int i=0;i<count;i++) 
      {   
       int id = _cursor.getInt(_columnIndex); 
       // 
       _videosId[i]= id; 
       // 
       _cursor.moveToNext(); 
       // 
      } 
     }catch(Exception ex) 
     { 
      showToast(ex.getMessage().toString());   
     } 

    } 
    public View getView(int position, View convertView, ViewGroup parent) 
    { 
     ImageView imgVw= new ImageView(_context);; 
     try 
     { 
      if(convertView!=null) 
      { 
       imgVw= (ImageView) convertView; 
      } 
      imgVw.setImageBitmap(getImage(_videosId[position])); 
      imgVw.setAdjustViewBounds(true); 
      imgVw.setBackgroundColor(Color.WHITE); 
      imgVw.setLayoutParams(new Gallery.LayoutParams(150, 100)); 
      imgVw.setPadding(5,5,5,5); 
      imgVw.setScaleType(ImageView.ScaleType.FIT_CENTER); 
     } 
     catch(Exception ex) 
     { 
      System.out.println("StartActivity:getView()-135: ex " + ex.getClass() +", "+ ex.getMessage()); 
     } 
     return imgVw; 
    } 


private final static Uri MEDIA_EXTERNAL_CONTENT_URI = MediaStore.Video.Media.EXTERNAL_CONTENT_URI; 
    private final static String _ID = MediaStore.Video.Media._ID; 
    private final static String MEDIA_DATA = MediaStore.Video.Media.DATA; 
but the result is : called showToast("meiyou"); 

我想知道，如果模拟机不能有视频缩略图？如果是如何插入视频缩略图，这样我可以debug.anf给我::

ERROR/AndroidRuntime(290):java.lang.ClassCastException:android.widget.AbsListView$LayoutParams 
ERROR/AndroidRuntime(290):at android.widget.Gallery.setUpChild(Gallery.java:769) 
ERROR/AndroidRuntime(290): at android.widget.Gallery.makeAndAddView(Gallery.java:738) 
ERROR/AndroidRuntime(290):  at android.widget.Gallery.layout(Gallery.java:622) 
ERROR/AndroidRuntime(290): at android.widget.Gallery.onLayout(Gallery.java:336) 
ERROR/AndroidRuntime(290):  at android.view.View.layout(View.java:7035) 
ERROR/AndroidRuntime(290):  at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1249) 
ERROR/AndroidRuntime(290):  at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1125) 
: ERROR/AndroidRuntime(290):  at android.widget.LinearLayout.onLayout(LinearLayout.java:1042) 
: ERROR/AndroidRuntime(290):  at android.view.View.layout(View.java:7035) 
ERROR/AndroidRuntime(290):  at android.widget.FrameLayout.onLayout(FrameLayout.java:333) 

Answer 1

改变这一行

imgVw.setLayoutParams(new Gallery.LayoutParams(150, 100)); 

到此

imgVw.setLayoutParams(new GridView.LayoutParams(150, 100));