它可以在Android 4.0或以上显示来自URL的视频缩略图？ [英] It is possible to display a video thumbnail from a URL on Android 4 and above?

问题描述

这两个以下正常工作在模拟器（2.3.3），而是一个真正的设备上（的Nexus小号 4.1.2）没有图像显示为缩略图。我也将尝试在的Andr​​oid 4.0模拟器运行。如果我设置一个默认的机器人：SRC 为的ImageView ，它不显示了呢。这让我觉得，它被替换，但的ImageView 是空的。

Both of the below works fine on the emulator (2.3.3), but on a real device (Nexus S with 4.1.2) no image is shown for the thumbnail. I will also try to run it on an Android 4 Emulator. If I set a default android:src for the ImageView, it is not shown anymore then. This makes me think that it is replaced, but the ImageView is empty.

public class MainActivity extends Activity {

    ImageView img;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        img = (ImageView)findViewById(R.id.img_thumbnail);
        new MyAsync().execute("http://commonsware.com/misc/test.mp4");
    }

    //This version is still not working, but it's more readable (edited: Selvin).
    public class MyAsync extends AsyncTask<String, Void, Bitmap>{

        @Override
        protected Bitmap doInBackground(String... objectURL) {
            //return ThumbnailUtils.createVideoThumbnail(objectURL[0], Thumbnails.MINI_KIND);
            return ThumbnailUtils.extractThumbnail(ThumbnailUtils.createVideoThumbnail(objectURL[0], Thumbnails.MINI_KIND), 100, 100);
        }

        @Override
        protected void onPostExecute(Bitmap result){
             img.setImageBitmap(result);
        }
    }
}

我知道，一个类似的问题已经问过，的 <一个href="http://stackoverflow.com/questions/10750502/displaying-video-thumbnails-in-android-device-from-remote-video-url">Displaying在Android设备上的视频缩略图，从远程视频网址 的，但我已经尝试过这一点，同样的结果。

I know that a similar question has been asked before, Displaying video thumbnails in an Android device from a remote video URL, but I have already tried this and same result.

为什么没有这项工作的设备上，以及如何使其发挥作用？

Why doesn't this work on the device and how make it work?

推荐答案

使用FFmpegMediaMetadataRetriever提取缩略图在所需位置：的 FFmpegMediaMetadataRetriever

Use FFmpegMediaMetadataRetriever to extract a thumbnail at the desired position: FFmpegMediaMetadataRetriever

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