Question

我正在尝试使用以下代码在我的应用程序中录制视频

Intent intent = new Intent(android.provider.MediaStore.ACTION_VIDEO_CAPTURE)
startActivityForResult(intent, CAPTURE_VIDEO_REQUEST_CODE);

这将打开视频录制模式。我录制视频，然后点击接受录制。但是，录制的视频永远不会保存到SD卡。我写了我的代码写入SD卡，如下所示。

/** Create a File for saving an image or video */
private static File getOutputMediaFile(int type){

    // Check that the SDCard is mounted
    File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
              Environment.DIRECTORY_PICTURES), "/Videos/MyCameraVideo");


    // Create the storage directory(MyCameraVideo) if it does not exist
    if (! mediaStorageDir.exists()){

        if (! mediaStorageDir.mkdirs()){

            output.setText("Failed to create directory MyCameraVideo.");

            Toast.makeText(ActivityContext, "Failed to create directory MyCameraVideo.", 
                    Toast.LENGTH_LONG).show();

            Log.d("App", "Failed to create directory MyCameraVideo.");
            return null;
        }
    }


    // Create a media file name

    // For unique file name appending current timeStamp with file name
    java.util.Date date= new java.util.Date();
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
                         .format(date.getTime());

    File mediaFile;

    if(type == MEDIA_TYPE_VIDEO) {

        // For unique video file name appending current timeStamp with file name
        mediaFile = new File(mediaStorageDir.getPath() + File.separator +
        "VID_"+ timeStamp + ".mp4");

    } else {
        return null;
    }

    return mediaFile;
}

 @Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {

    // After camera screen this code will excuted

    if (requestCode == CAPTURE_VIDEO_ACTIVITY_REQUEST_CODE) {

        if (resultCode == RESULT_OK) {

            //data is null over here
            status.setText("Video File : " +data.getData());

            Toast.makeText(this, "Video recorded successfully!", Toast.LENGTH_LONG).show();

        } 

    }
}

此外，在调试时，onActivityResult方法的数据为空。

请有人告诉我如何将视频写入SD卡。我在上面的代码在Android手机上测试时效果很好，但在Glass中没有这样做。这是一个错误吗？

Answer 1

onActivityResult将为null，因为视频未通过处理完成。您需要使用文件观察器并等待媒体完全处理。

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == TAKE_PICTURE_REQUEST && resultCode == RESULT_OK) {
        String picturePath = data.getStringExtra(
                CameraManager.EXTRA_PICTURE_FILE_PATH);
        processPictureWhenReady(picturePath);
    }

    super.onActivityResult(requestCode, resultCode, data);
}

private void processPictureWhenReady(final String picturePath) {
    final File pictureFile = new File(picturePath);

    if (pictureFile.exists()) {
        // The picture is ready; process it.
    } else {
        // The file does not exist yet. Before starting the file observer, you
        // can update your UI to let the user know that the application is
        // waiting for the picture (for example, by displaying the thumbnail
        // image and a progress indicator).

        final File parentDirectory = pictureFile.getParentFile();
        FileObserver observer = new FileObserver(parentDirectory.getPath(),
                FileObserver.CLOSE_WRITE | FileObserver.MOVED_TO) {
            // Protect against additional pending events after CLOSE_WRITE
            // or MOVED_TO is handled.
            private boolean isFileWritten;

            @Override
            public void onEvent(int event, String path) {
                if (!isFileWritten) {
                    // For safety, make sure that the file that was created in
                    // the directory is actually the one that we're expecting.
                    File affectedFile = new File(parentDirectory, path);
                    isFileWritten = affectedFile.equals(pictureFile);

                    if (isFileWritten) {
                        stopWatching();

                        // Now that the file is ready, recursively call
                        // processPictureWhenReady again (on the UI thread).
                        runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                processPictureWhenReady(picturePath);
                            }
                        });
                    }
                }
            }
        };
        observer.startWatching();
    }
}

此代码用于保存照片。视频应该类似。我从GDK的官方文档中得到了这个。

无法在Google Glass XE 19.1中保存录制的视频

1 个答案: