ListViewはスクロールダウン後の実際のビデオファイルを表示しません

Question

私のアプリでは、ListViewにSDカードのビデオを表示しています。 ListViewは、ビデオのサムネイル、タイトル、サイズ、期間を表示します。下にスクロールすると同じビデオとサムネイルが表示されますが、アイテムをクリックすると別の動画ファイルが別のアクティビティに表示されます。私はちょうどListViewで実際のビデオは私がスクロールダウンかどうかを表示します。

ここに私のコードです。

LoadVideoは、この点からAppCompatActivity {

private Cursor videoCursor; 
private int video_column_index; 
ListView videoList; 
int count; 
String[] thumbColumns = {MediaStore.Video.Thumbnails.DATA, 
     MediaStore.Video.Thumbnails.VIDEO_ID}; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.load_video_activity); 
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 

    init_phone_video_grid(); 
} 

private void init_phone_video_grid() 
{ 
    String[] proj = {MediaStore.Video.Media._ID, 
      MediaStore.Video.Media.DATA, 
      MediaStore.Video.Media.DISPLAY_NAME, 
      MediaStore.Video.Media.SIZE, 
      MediaStore.Video.Media.DURATION}; 

    videoCursor = getContentResolver().query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, proj, null, null, null); 
    count = videoCursor.getCount(); 

    videoList = (ListView) findViewById(R.id.videoList); 
    videoList.setAdapter(new VideoAdapter(this.getApplicationContext())); 
    videoList.setOnItemClickListener(videoGridListener); 
} 

private AdapterView.OnItemClickListener videoGridListener = new AdapterView.OnItemClickListener() { 
    @Override 
    public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) { 

     video_column_index = videoCursor.getColumnIndexOrThrow(MediaStore.Video.Media.DATA); 
     videoCursor.moveToPosition(i); 
     String fileName = videoCursor.getString(video_column_index); 
     Intent intent = new Intent(LoadVideo.this, ShowVideo.class); 
     intent.putExtra("videofilename", fileName); 
     startActivity(intent); 
    } 
}; 

public class VideoAdapter extends BaseAdapter 
{ 
    Context context; 

    VideoAdapter(Context context) 
    { 
     this.context = context; 
    } 

    @Override 
    public int getCount() { 
     return count; 
    } 

    @Override 
    public Object getItem(int i) { 
     return i; 
    } 

    @Override 
    public long getItemId(int i) { 
     return i; 
    } 

    @Override 
    public View getView(int i, View view, ViewGroup viewGroup) 
    { 
     ViewHolder viewHolder; 
     String id; 

     if (view == null) 
     { 
      viewHolder = new ViewHolder(); 
      view = LayoutInflater.from(context).inflate(R.layout.list_items, viewGroup, false); 

      viewHolder.titleName = (TextView) view.findViewById(R.id.title); 
      viewHolder.duration = (TextView) view.findViewById(R.id.duration); 
      viewHolder.size = (TextView) view.findViewById(R.id.size); 
      viewHolder.thumbImage = (ImageView) view.findViewById(R.id.imageIcon); 

      //Title 
      video_column_index = videoCursor.getColumnIndexOrThrow(MediaStore.Video.Media.DISPLAY_NAME); 
      videoCursor.moveToPosition(i); 
      id = videoCursor.getString(video_column_index); 
      viewHolder.titleName.setText(id); 

      //Size 
      video_column_index = videoCursor.getColumnIndexOrThrow(MediaStore.Video.Media.SIZE); 
      videoCursor.moveToPosition(i); 

      String vSize; 
      long videoSize = videoCursor.getLong(video_column_index); 
      double actualSizeInMB = videoSize/(1024.0 * 1024.0); 
      DecimalFormat dec = new DecimalFormat("0.00"); 

      if (actualSizeInMB > 1) 
      { 
       vSize = dec.format(actualSizeInMB).concat(" MB"); 
       viewHolder.size.setText(vSize); 
      } 
      else 
      { 
       vSize = dec.format(actualSizeInMB).concat(" KB"); 
       viewHolder.size.setText(vSize); 
      } 

      //Duration 
      video_column_index = videoCursor.getColumnIndexOrThrow(MediaStore.Video.Media.DURATION); 
      videoCursor.moveToPosition(i); 
      long time = videoCursor.getLong(video_column_index); 
      long seconds = time/1000; 
      long minutes = seconds/60; 
      seconds = seconds % 60; 
      String setTime ; 
      if (seconds < 10) 
      { 
       setTime = String.valueOf(minutes) + ":0" + String.valueOf(seconds); 
       viewHolder.duration.setText(setTime.concat(" | ")); 
      } 
      else 
      { 
       setTime = String.valueOf(minutes) + ":" + String.valueOf(seconds); 
       viewHolder.duration.setText(setTime.concat(" | ")); 
      } 

      //String[] proj = { MediaStore.Video.Media._ID, MediaStore.Video.Media.DISPLAY_NAME, MediaStore.Video.Media.DATA }; 
      //Cursor cursor = getContentResolver().query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, proj, 
        //MediaStore.Video.Media.DISPLAY_NAME + "=?", new String[] { id }, null); 
      //cursor.moveToFirst(); 
      //long ids = cursor.getLong(cursor.getColumnIndex(MediaStore.Video.Media._ID)); 

      long ids = videoCursor.getInt(videoCursor.getColumnIndex(MediaStore.Video.Media._ID)); 
      ContentResolver crThumb = getContentResolver(); 
      BitmapFactory.Options options = new BitmapFactory.Options(); 
      options.inSampleSize = 1; 
      Bitmap curThumb = MediaStore.Video.Thumbnails.getThumbnail(crThumb, ids, MediaStore.Video.Thumbnails.MICRO_KIND, options); 
      viewHolder.thumbImage.setImageBitmap(curThumb); 
      curThumb = null; 

      //video_column_index = videoCursor.getColumnIndexOrThrow(MediaStore.Video.Media.DATA); 
      //videoCursor.moveToPosition(i); 
      //String path = videoCursor.getString(video_column_index); 
      //Bitmap thumbnail = ThumbnailUtils.createVideoThumbnail(path, MediaStore.Video.Thumbnails.MICRO_KIND); 
      //viewHolder.thumbImage.setImageBitmap(thumbnail); 

      //videoThumbnailCursor.close(); 

     } 

     return view; 
    } 

    private class ViewHolder 
    { 
     TextView titleName; 
     TextView size; 
     TextView duration; 
     ImageView thumbImage; 
    } 
} 

}

Answer 1

を拡張するパブリック・クラス：if(view == null)は、同じようにコードを変更します。

if (view == null) { 
     viewHolder = new ViewHolder(); 
     view = LayoutInflater.from(context).inflate(R.layout.list_items, viewGroup, false); 
     viewHolder.titleName = (TextView) view.findViewById(R.id.title); 
     viewHolder.duration = (TextView) view.findViewById(R.id.duration); 
     viewHolder.size = (TextView) view.findViewById(R.id.size); 
     viewHolder.thumbImage = (ImageView) view.findViewById(R.id.imageIcon); 
     view.setTag(viewHolder); 

} else { 

     viewHolder = (ViewHolder)(view.getTag()); 
} 
//Title.....and so on...