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我无法从 SD 卡中获取视频并将其设置为 gridview。这就是我目前所困的地方。到目前为止，我的逻辑是我试图将目录设置为字符串数组，然后将这些值与适配器一起使用。我也不太确定将视频转换为缩略图。它当前所做的是显示一个白屏。您的帮助将不胜感激。

    public class Gridview extends Activity {

    private static final String thepath = "/sdcard/Pictures/";
    private static final File path =  Environment.getExternalStoragePublicDirectory(thepath);
    private static final String TAG = null;
    String[] Reelfiles;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.preview);

        File directory = new File(thepath);
        directory.mkdirs();
        Reelfiles = directory.list();

        GridView gridView = (GridView) findViewById(R.id.gridview);
        gridView.setAdapter(new VideoAdapter(this, Reelfiles));

        }



public class  VideoAdapter extends BaseAdapter {
    Context mContext;
    Bitmap bmThumbnail;

    private String[] Reelfiles;
    public VideoAdapter(Context c) {

    }

    public VideoAdapter(Context context, String[] Reelfiles) {
          this.mContext = context;
          this.Reelfiles = Reelfiles;
      }
    public int getCount() {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public Object getItem(int arg0) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public long getItemId(int arg0) {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {


        bmThumbnail = ThumbnailUtils.createVideoThumbnail(Reelfiles[position], Thumbnails.MICRO_KIND);


        ImageView imageView = new ImageView(mContext);
        imageView.setImageBitmap(bmThumbnail);
        imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
        imageView.setLayoutParams(new GridView.LayoutParams(70, 70));
        return imageView;

    }



        }

预览.xml

<?xml version="1.0" encoding="utf-8"?>
<GridView xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/gridview"
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"
    android:columnWidth="90dp"
    android:numColumns="auto_fit"
    android:verticalSpacing="10dp"
    android:horizontalSpacing="10dp"
    android:stretchMode="columnWidth"
    android:gravity="center"

/>

我的日志

04-03 12:18:10.079: E/MediaMetadataRetrieverJNI(14433): getFrameAtTime: videoFrame is a NULL pointer
04-03 12:18:10.089: E/MediaMetadataRetrieverJNI(14433): getFrameAtTime: videoFrame is a NULL pointer
04-03 12:18:10.094: E/MediaMetadataRetrieverJNI(14433): getFrameAtTime: videoFrame is a NULL pointer
04-03 12:18:10.104: V/InputMethodManager(14433): Starting input: tba=android.view.inputmethod.EditorInfo@415218b0 ic=null
04-03 12:18:10.119: E/MediaMetadataRetrieverJNI(14433): getFrameAtTime: videoFrame is a NULL pointer
04-03 12:18:10.264: W/SurfaceView(14433): CHECK surface infomation creating=false formatChanged=false sizeChanged=false visible=false visibleChanged=true surfaceChanged=true realSizeChanged=false redrawNeeded=false left=false top=false
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0 回答 0