如何将自定义相机录制的视频返回至Messenger应用

Got it, let's walk through how to set up your camera app to return the recorded video file/Uri to apps like Messenger or Telegram using EXTRA_OUTPUT:

1. Confirm Your Manifest Intent Filter #

First, make sure your camera app's Activity has the correct intent filter to respond to video capture requests. You already have the right base setup—here's the properly formatted version:

<?xml version="1.0" encoding="utf-8"?>
<intent-filter>
    <action android:name="android.media.action.VIDEO_CAPTURE"/>
    <category android:name="android.intent.category.DEFAULT"/>
</intent-filter>

This tells Android that your app can handle video capture intents from other apps.

2. Handle the Incoming Intent and Return the Video #

Next, in your camera Activity, you need to do three key things:

• Grab the EXTRA_OUTPUT Uri that the calling app (like Messenger) sends
• Save your recorded video directly to that Uri
• Send the Uri back to the calling app once recording is done

Here's a simplified example of how to implement this logic:

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

    // Retrieve the output Uri from the incoming intent
    Uri outputUri = getIntent().getParcelableExtra(MediaStore.EXTRA_OUTPUT);

    // When recording finishes (e.g., user taps "Save"):
    // Assume you've successfully saved the video to outputUri
    Intent resultIntent = new Intent();
    resultIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputUri);
    setResult(RESULT_OK, resultIntent);
    finish();
}

Note: Don’t forget to handle cases where outputUri is null—some apps might not send it, so you’ll need a fallback save location for those scenarios.

3. Reference: How Apps Like Messenger Call the Camera #

As you suspected, calling apps use a pattern similar to this (adjusted for video capture instead of photos):

File videoFile = new File(getExternalFilesDir(Environment.DIRECTORY_MOVIES), "temp_video.mp4");
Uri videoUri = FileProvider.getUriForFile(this, "com.your.package.fileprovider", videoFile);

Intent captureVideoIntent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
captureVideoIntent.putExtra(MediaStore.EXTRA_OUTPUT, videoUri);
startActivityForResult(captureVideoIntent, REQUEST_CODE_VIDEO_CAPTURE);

They specify their desired save location via EXTRA_OUTPUT, then wait for your app to send that Uri back in the result.

内容的提问来源于stack exchange，提问作者mrneumann888