Android 视频缩略图为空

Question

所以基本上我想要实现的是用户可以选择选择现有视频或拍摄新视频，但我的位图始终为空值。

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_VIDEO_CAPTURE && resultCode == RESULT_OK || requestCode == SELECT_VIDEO && resultCode == RESULT_OK) {
        Uri selectedVideo = data.getData();
        addVideoToTable(ThumbnailUtils.createVideoThumbnail(selectedVideo.getPath(), MediaStore.Video.Thumbnails.MINI_KIND));
    }
}

public void addVideoToTable(Bitmap video) {
    TableLayout tl = (TableLayout)findViewById(R.id.videoTable);
    if (videoCount == 0 || videoCount % 3 == 0) {
        tr = new TableRow(this);
        tr.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.FILL_PARENT, TableRow.LayoutParams.WRAP_CONTENT, Gravity.CENTER_HORIZONTAL));
        tl.addView(tr);
    }
    ImageView iv = new ImageView(this);
    iv.setImageBitmap(video);
    iv.setPadding(0, 0, 10, 10);
    iv.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT, 300, 1f));
    tr.addView(iv);
    videoCount++;
}

Answer 1

试试：

public String getPathFromURI(Uri uri) {
    Cursor cursor = getContentResolver().query(uri, null, null, null, null);

    //Source not from device capture or selection
    if (cursor == null) { 
        return uri.getPath();
    } else {
        cursor.moveToFirst();
        int idx = cursor.getColumnIndex(MediaStore.MediaColumns.DATA);
        if ( idx == -1 ) {
            return uri.getPath();
    }

    String path =  cursor.getString(idx);
    cursor.close();
    return path;
}

这适用于您选择捕获或存储在用户设备上的本地视频。它不适合您的原因是您获得的只是原始路径，而不是 ThumbnailUtils 方法使用的媒体存储中的路径。