以意图开始修剪视频活动

Question

我现在可以拍摄一个有意图的视频,创建一个启动默认视频修剪器活动的意图是什么？并检查它是否出现在设备上？

Answer 1

此解决方案依赖于设备上安装的AOSP Gallery2软件包版本.你可以这样做:

// The Intent action is not yet published as a constant in the Intent class
// This one is served by the com.android.gallery3d.app.TrimVideo activity
// which relies on having the Gallery2 app or a compatible derivative installed
Intent trimVideoIntent = new Intent("com.android.camera.action.TRIM");

// The key for the extra has been discovered from com.android.gallery3d.app.PhotoPage.KEY_MEDIA_ITEM_PATH
trimVideoIntent.putExtra("media-item-path", getFilePathFromVideoURI(this, videoUri));
trimVideoIntent.setData(videoUri);

// Check if the device can handle the Intent
List<ResolveInfo> list = getPackageManager().queryIntentActivities(trimVideoIntent, 0);
if (null != list && list.size() > 0) {
    startActivity(trimVideoIntent); // Fires TrimVideo activity into being active
}

该方法getFilePathFromVideURI基于以下问题的答案:从mediastore获取URI的文件名和路径

public String getFilePathFromVideoURI(Context context, Uri contentUri) {
    Cursor cursor = null;
    try {
        String[] proj = { MediaStore.Video.Media.DATA };
        cursor = context.getContentResolver().query(contentUri,  proj, null, null, null);
        int column_index = cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DATA);
        cursor.moveToFirst();
        return cursor.getString(column_index);
    } finally {
        if (cursor != null) {
            cursor.close();
        }
    }
}

videoUri是Uri指着这样的事情:content://media/external/video/media/43.您可以通过发出ACTION_PICK意图来收集一个:

Intent pickVideoUriIntent =  new Intent(Intent.ACTION_PICK, MediaStore.Video.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(pickVideoUriIntent, PICK_VIDEO_REQUEST);

在onActivityResult得到像这样的URI:

....
case PICK_VIDEO_REQUEST:
    Uri videoUri = data.getData();
     ...

此解决方案适用于我的Galaxy Nexus和Android 4.3 Jelly Bean.

我不确定这是否适用于所有Android设备.更可靠的解决方案可能是分叉Gallery2应用程序并将TrimVideo活动及其依赖项放入可随应用程序提供的库中.希望无论如何都有帮助.