android - 点击并按住以录制视频，如 Vine

Question

我想制作一个录制视频的应用程序，它看起来像藤蔓，按住录制，释放它停止，按住录制并保持到最后。

我用过MediaRecorder，但它一次只记录一次，如果我再次开始记录，应用程序就会崩溃。

请告诉我有什么办法可以做到这一点？
我编辑了我的代码:

public class VideoRecordingActivity extends AppCompatActivity implements View.OnTouchListener, View.OnLongClickListener {
private Context myContext;
private boolean hasCamera;
private boolean onRecording;

private Camera mCamera;
private CameraPreview mPreview;
private MediaRecorder mediaRecorder;
private boolean cameraFront = false;
private int cameraId;

private int videoNumer;
private boolean isActionDown = false;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_video_introduction_recording);
    initUI();
    initialize();
}
private LinearLayout lnCameraPreview;
private ImageButton btn_recording;

private void initUI() {
    lnCameraPreview = (LinearLayout) findViewById(R.id.ln_body_recording);
    btn_recording = (ImageButton) findViewById(R.id.btn_recording);

}

public void initialize() {
    myContext = this;
    mPreview = new CameraPreview(this, cameraId, mCamera);
    lnCameraPreview.addView(mPreview);
    btn_recording.setOnLongClickListener(this);
    btn_recording.setOnTouchListener(this);
    videoNumer = 0;
}
public boolean onLongClick(View v) {
    isActionDown = true;
    try {
        boolean isPrepared = false;
        if (isActionDown)
            isPrepared = prepareMediaRecorder();
        if (isPrepared && isActionDown) {
            // work on UiThread for better performance
            runOnUiThread(new Runnable() {
                public void run() {
                    mediaRecorder.start();
                    onRecording = true;
                }
            });

        }
    } catch (Exception e) {
        e.printStackTrace();
        Log.e("onLongPress Error ", e.toString());
    }

    return true;
}


@Override
public boolean onTouch(View v, MotionEvent event) {
    switch (event.getAction()) {
        case MotionEvent.ACTION_UP:
            isActionDown = false;

            try {
                if (onRecording) {

                    if (mediaRecorder != null) {
                        mediaRecorder.stop();
                    }
                    onRecording = false;
                    videoNumer++;
                }
            } catch (IllegalStateException e) {
                e.printStackTrace();
            } catch (Exception e) {
                e.printStackTrace();
            }
            break;
    }
    return false;
}



public void onResume() {
    super.onResume();
    if (!hasCamera(myContext)) {
        Toast.makeText(myContext, "Sorry, your phone does not have a camera!", Toast.LENGTH_LONG).show();
        return;
    }
    initCamera();
}

@Override
protected void onPause() {
    super.onPause();
    // when on Pause, release camera in order to be used from other
    // applications
    releaseCamera();
}


private final int cMaxRecordDurationInMs = 30000;
private final long cMaxFileSizeInBytes = 5000000;
private final int cFrameRate = 20;
private File prRecordedFile;

@SuppressLint("SdCardPath")
private boolean prepareMediaRecorder() {
    mediaRecorder = new MediaRecorder();

    try {
        mCamera.unlock();
    } catch (Exception ex) {
        return false;
    }

        // adjust the camera the way you need
        mediaRecorder.setCamera(mCamera);
    mediaRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
    mediaRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);

        //
        CamcorderProfile cpHigh = CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH);
        mediaRecorder.setProfile(cpHigh);
        mediaRecorder.setPreviewDisplay(mPreview.getHolder().getSurface());

    mediaRecorder.setOutputFile("/sdcard/" + videoNumer + "videocapture_example.mp4");

    //set max size
    mediaRecorder.setMaxDuration(600000); // Set max duration 60 sec.
    mediaRecorder.setMaxFileSize(50000000); // Set max file size 50M

    try {
        mediaRecorder.prepare();
    } catch (Exception e) {
        releaseMediaRecorder();
        e.printStackTrace();
    }
    return true;
}

private void releaseMediaRecorder() {
    if (mediaRecorder != null) {
        mediaRecorder.reset(); // clear recorder configuration
        mediaRecorder.release(); // release the recorder object
        mediaRecorder = null;
        if (mCamera != null) {
            mCamera.lock(); // lock camera for later use
        }
    }
}

/**
 * Camera
 */

private void initCamera() {
    if (mCamera == null) {
        // if the front facing camera does not exist
        if (findFrontFacingCamera() < 0) {
            Toast.makeText(this, "No front facing camera found.", Toast.LENGTH_LONG).show();
        }
        mCamera = Camera.open(findBackFacingCamera());
        mPreview.refreshCamera(mCamera);
    }
    onRecording = false;
}

private boolean hasCamera(Context context) {
    // check if the device has camera
    if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
        hasCamera = true;
    } else {
        hasCamera = false;
    }
    return hasCamera;
}

private int findFrontFacingCamera() {
    int cameraId = -1;
    // Search for the front facing camera
    int numberOfCameras = Camera.getNumberOfCameras();
    for (int i = 0; i < numberOfCameras; i++) {
        Camera.CameraInfo info = new Camera.CameraInfo();
        Camera.getCameraInfo(i, info);
        if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
            cameraId = i;
            cameraFront = true;
            break;
        }
    }
    this.cameraId = cameraId;
    return cameraId;
}

private int findBackFacingCamera() {
    int cameraId = -1;
    // Search for the back facing camera
    // get the number of cameras
    int numberOfCameras = Camera.getNumberOfCameras();
    // for every camera check
    for (int i = 0; i < numberOfCameras; i++) {
        Camera.CameraInfo info = new Camera.CameraInfo();
        Camera.getCameraInfo(i, info);
        if (info.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {
            cameraId = i;
            cameraFront = false;
            break;
        }
    }
    this.cameraId = cameraId;
    return cameraId;
}

public void switchCamera() {
    // if the camera preview is the front
    if (cameraFront) {
        int cameraId = findBackFacingCamera();
        if (cameraId >= 0) {
            // open the backFacingCamera
            mCamera = Camera.open(cameraId);
            // refresh the preview
            mPreview.refreshCamera(mCamera);
        }
    } else {
        int cameraId = findFrontFacingCamera();
        if (cameraId >= 0) {
            // open the backFacingCamera
            mCamera = Camera.open(cameraId);
            // refresh the preview
            mPreview.refreshCamera(mCamera);
        }
    }
}

private void releaseCamera() {
    // stop and release camera
    if (mCamera != null) {
        mCamera.release();
        mCamera = null;
    }
}

}

Answer 1

您可以通过在录制按钮上设置 OnLongClickListener() 和 OnTouchListener() 来实现此功能。像这样:

recordBtn.setOnLongClickListener(recordBtnLCListener);
recordBtn.setOnTouchListener(recordBtnTouchListener);

然后 :

@Override
public boolean onLongClick(View v) {
    ivCancel.setVisibility(View.GONE);
    ivDone.setVisibility(View.GONE);
    isActionDown = true;
    try {
        if (isActionDown) {
            initRecorder();
            if (isActionDown)
                prepareRecorder();
        }
        if (isPrepared && isActionDown) {
            mMediaRecorder.start();
            isRecording = true;
        }
    } catch (Exception e) {
        e.printStackTrace();
        Log.e("onLongPress Error ", e.toString());
    }

    return true;
}

和 :

@Override
public boolean onTouch(View v, MotionEvent event) {
    switch (event.getAction()) {
        case MotionEvent.ACTION_UP:
            isActionDown = false;

            try {
                if (isRecording) {

                    if (mMediaRecorder != null) {
                        mMediaRecorder.stop();
                    }
                    isRecording = false;
                }
            } catch (IllegalStateException e) {
                e.printStackTrace();
            } catch (Exception e) {
                e.printStackTrace();
            }
            break;
    }
    return false;
}

因此，通过这种方式您可以录制视频的各个部分。意味着每次长按录制按钮时，录制开始。当您松开按钮时，录制将停止，您必须将这部分视频保存在任何临时文件夹中。
一旦你完成了你想要的视频的所有部分，那么你必须将视频的所有部分组合起来制作一个视频。

这是合并保存在 tempory 文件夹中的所有视频部分的代码:

public void mergeVideos() {
    try {
        List<Movie> inMovies = new ArrayList<>();
        for (int i = 0; i < videosPathList.size(); i++) {
            String filePath = videosPathList.get(i);
            try {
                Movie movie = MovieCreator.build(filePath);
                if (movie != null)
                    inMovies.add(movie);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        List<Track> videoTracks = new LinkedList<Track>();
        List<Track> audioTracks = new LinkedList<Track>();
        for (Movie m : inMovies) {
            for (Track t : m.getTracks()) {
                try {
                    if (t.getHandler().equals("soun")) {
                        audioTracks.add(t);
                    }
                    if (t.getHandler().equals("vide")) {
                        videoTracks.add(t);
                    }
                } catch (Exception e) {

                }
            }
        }
        Movie result = new Movie();
        if (audioTracks.size() > 0) {
            result.addTrack(new AppendTrack(audioTracks
                    .toArray(new Track[audioTracks.size()])));
        }
        if (videoTracks.size() > 0) {
            result.addTrack(new AppendTrack(videoTracks
                    .toArray(new Track[videoTracks.size()])));
        }
        BasicContainer out = (BasicContainer) new DefaultMp4Builder().build(result);
        File f = null;
        String finalVideoPath;
        try {
            f = setUpVideoFile(Environment
        .getExternalStorageDirectory()+"/MyApp/videos/");
            finalVideoPath = f.getAbsolutePath();

        } catch (IOException e) {
            e.printStackTrace();
            f = null;
            finalVideoPath = null;
        }
        WritableByteChannel fc = new RandomAccessFile(finalVideoPath, "rw").getChannel();
        out.writeContainer(fc);
        fc.close();
        deleteFilesDir(); //In this method you have to delete all parts of video stored in temporary folder.


    } catch (Exception e) {
        e.printStackTrace();
       progressDialog.dismiss();
        finish();
    }
}

File setUpVideoFile(String directory) throws IOException {
    File videoFile = null;
    if (Environment.MEDIA_MOUNTED.equals(Environment
            .getExternalStorageState())) {
        File storageDir = new File(directory);
        if (storageDir != null) {
            if (!storageDir.mkdirs()) {
                if (!storageDir.exists()) {
                    Log.d("CameraSample", "failed to create directory");
                    return null;
                }
            }
        }
        videoFile = File.createTempFile("video_"
                        + System.currentTimeMillis() + "_",
                .mp4, storageDir);
    }
    return videoFile;
}

您可以在停止 mediaRecorder 后调用 mergeVideos() 方法。

希望这段代码对您有所帮助。 :)

要合并视频，您必须使用 isoparser 库。因此，您必须在 gradle 文件中添加以下依赖项:

compile 'com.googlecode.mp4parser:isoparser:1.0.5.4'