时间 - 有限的视频录制：在相机应用程序中显示最长时间

Question

我正在开发一个需要视频捕获的应用程序。

一切正常，例如：

1. 打开摄像头进行视频录制。
2. 视频正在录制 20 秒。
3. 视频预览和一切。

问题：

问题是当我开始视频录制时，相机应用程序会在 20 秒后停止视频录制（这是正确的），但用户仅在 20 秒后收到“已达到最长录制时间”的通知。

在录制时它正在显示：

（记录时间）/（可记录的总时间）。

我想要什么：

我想显示用户（剩余时间）/（20 秒）。

这是我的代码：

public class MainActivity extends AppCompatActivity {

    private static final int REQUEST_VIDEO_CAPTURE = 1;
    private static final int MAXIMUM_VIDEO_RECORDING_LIMIT = 20;
    private static final int VIDEO_RECORDING_QUALITY = 0;

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

        dispatchTakeVideoIntent();
    }

    private void dispatchTakeVideoIntent() {

        Intent takeVideoIntent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
        takeVideoIntent.putExtra(MediaStore.EXTRA_DURATION_LIMIT, MAXIMUM_VIDEO_RECORDING_LIMIT);
        takeVideoIntent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, VIDEO_RECORDING_QUALITY);

        if (takeVideoIntent.resolveActivity(getPackageManager()) != null) {
            startActivityForResult(takeVideoIntent, REQUEST_VIDEO_CAPTURE);
        }
    }

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

        if (requestCode == REQUEST_VIDEO_CAPTURE && resultCode == RESULT_OK) {

            Uri file = data.getData();

        }
    }
}

如何实现，请帮忙。

Answer 1

这是一个使用 MediaRecorder 的简单视频录制示例：

在此您还可以定义视频录制的最大时间限制和文件大小。

public class VideoCapture extends Activity implements OnClickListener, SurfaceHolder.Callback {
    MediaRecorder recorder;
    SurfaceHolder holder;
    boolean recording = false;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

        recorder = new MediaRecorder();
        initRecorder();
        setContentView(R.layout.main);

        SurfaceView cameraView = (SurfaceView) findViewById(R.id.CameraView);
        holder = cameraView.getHolder();
        holder.addCallback(this);
        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

        cameraView.setClickable(true);
        cameraView.setOnClickListener(this);
    }

    private void initRecorder() {
        recorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
        recorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);

        CamcorderProfile cpHigh = CamcorderProfile
                .get(CamcorderProfile.QUALITY_HIGH);
        recorder.setProfile(cpHigh);
        recorder.setOutputFile("/sdcard/videocapture_example.mp4");
        recorder.setMaxDuration(50000); // 50 seconds
        recorder.setMaxFileSize(5000000); // Approximately 5 megabytes
    }

    private void prepareRecorder() {
        recorder.setPreviewDisplay(holder.getSurface());

        try {
            recorder.prepare();
        } catch (IllegalStateException e) {
            e.printStackTrace();
            finish();
        } catch (IOException e) {
            e.printStackTrace();
            finish();
        }
    }

    public void onClick(View v) {
        if (recording) {
            recorder.stop();
            recording = false;

            // Let's initRecorder so we can record again
            initRecorder();
            prepareRecorder();
        } else {
            recording = true;
            recorder.start();
        }
    }

    public void surfaceCreated(SurfaceHolder holder) {
        prepareRecorder();
    }

    public void surfaceChanged(SurfaceHolder holder, int format, int width,
            int height) {
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
        if (recording) {
            recorder.stop();
            recording = false;
        }
        recorder.release();
        finish();
    }
}