如何在当前 activity 具有 SurfaceView 时 return 到上一个 activity？

Question

我知道如何 return 到以前的 activity 因为 usual.The 当前 activity(VideoActivity.java) 有 SurfaceView MediaRecorder 录制视频。每当我将 finish() 实现到 return 到之前的 activity 时，它都会导致如下 logcat 的错误：

E/BufferQueueProducer: [SurfaceView] dequeueBuffer: BufferQueue has been abandoned 
E/EmulatedCamera_Preview: onNextFrameAvailable: Unable to dequeue preview window buffer: 19 -> No such device

logcat只是重复了上面两行，变成了很长的列表，所以我只显示了这两行。

除了显示上面的 logcat 之外，每当我打算 VideoActivity.java 时，应用程序就会停止。

这就是我实现 return 到之前的 activity

的方式

backButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                if(isRecording){
                    stopRecording();
                    finish();
                }else{
                    finish();
                }

        }
    });

基本上我是这样实现 SurfaceView 的：

public class VideoActivity extends AppCompatActivity implements SurfaceHolder.Callback{

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

    surfaceHolder = videoSurface.getHolder();
    surfaceHolder.addCallback(this);
    surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

    backButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            if(isRecording){
                stopRecording();
                finish();
            }else{
                finish();
            }

        }
    });
}


@Override
public void surfaceCreated(SurfaceHolder holder) {
    try{
        mCamera = Camera.open();
    }catch (RuntimeException ex){
        ex.printStackTrace();
    }

    try{
        mCamera.setPreviewDisplay(surfaceHolder);
        mCamera.startPreview();
    }catch (Exception e){
        e.printStackTrace();
    }
    prepareRecorder();
}

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

}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
    mRecorder.reset();
    mRecorder.release();
    mCamera.release();

    // once the objects have been released they can't be reused
    mRecorder = null;
    mCamera = null;    }

}

在我使用 finish().

return 到之前的 activity 之前，这段代码工作正常

所以我的问题是，如果一个 activity 有 SurfaceView，它怎么能 return 到以前的 activity？请告诉我正确的方法。

Answer 1

我意识到我没有发布 Camera 和 MediaRecorder。我可以通过在 finish() 之前发布 Camera 和 mediaRecorder 来解决这个问题, 所以代码看起来像这样

back.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(isRecording){
                    Log.d("Video","stop recording");
            try{
                   mRecorder.stop();
            }catch (RuntimeException e) {

            }
            releaseMediaRecorder();
            mCamera.lock();
            isRecording = false;
            releaseCamera();
                    finish();
                }else{
                    releaseCamera();
                    finish();
                }

            }
        });
}

private void releaseCamera(){
        if (mCamera != null){
            // release the camera for other applications
            mCamera.setPreviewCallback(null);
            surfaceHolder.removeCallback(VideoActivity.this);
            mCamera.release();
            mCamera = null;
        }
}

private void releaseMediaRecorder(){
        if (mRecorder != null) {
            // clear recorder configuration
            mRecorder.reset();

            mRecorder.release();
            mRecorder = null;

            mCamera.lock();
        }
}

如何在当前 activity 具有 SurfaceView 时 return 到上一个 activity？

How to return to previous activity when current activity having SurfaceView?

android

surfaceview