我已经构建了一个应用程序，可以在您触摸预览时拍摄照片。 我可以拍很多照片，但有时当我触摸预览拍照时，没有快门声，整个应用程序冻结。此外，在此之后，如果我尝试启动内置相机应用程序，我会收到相机无法使用的消息。Android相机 - 有时当我拍照时，应用程序冻结，相机不可用

我不知道这种行为的原因，它随机发生，当它发生时，我必须重新启动设备(三星Galaxy S)才能够再次使用相机。

在DDM，碰撞后，可看到下面的行：keyDispatchingTimedOut

下面是相关的代码： CameraActivity类别：

public class CameraActivity extends Activity {

private static final String TAG = "CameraDemo";

Preview preview;

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

preview = new Preview(this);

((FrameLayout) findViewById(R.id.preview)).addView(preview);

((FrameLayout) findViewById(R.id.preview)).setOnTouchListener(preview);

Log.d(TAG, "Camera Activity Created.");

}

}

预览类别：

class Preview extends SurfaceView implements SurfaceHolder.Callback, OnTouchListener {

private static final String TAG = "Preview";

SurfaceHolder mHolder;

public Camera camera;

Context ctx;

boolean previewing = false;

Preview(Context context) {

super(context);

ctx = context;

// Install a SurfaceHolder.Callback so we get notified when the

// underlying surface is created and destroyed.

mHolder = getHolder();

mHolder.addCallback(this);

mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

}

// Called once the holder is ready

public void surfaceCreated(SurfaceHolder holder) {

// The Surface has been created, acquire the camera and tell it where

// to draw.

camera = Camera.open();

}

// Called when the holder is destroyed

public void surfaceDestroyed(SurfaceHolder holder) {

if (camera != null) {

camera.setPreviewCallback(null);

camera.stopPreview();

camera.release();

camera = null;

}

previewing = false;

}

// Called when holder has changed

public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {

if(previewing){

camera.stopPreview();

previewing = false;

}

if (camera != null){

try {

camera.setDisplayOrientation(90);

camera.setPreviewDisplay(holder);

camera.setPreviewCallback(new PreviewCallback() {

// Called for each frame previewed

public void onPreviewFrame(byte[] data, Camera camera) {

Log.d(TAG, "onPreviewFrame called at: " + System.currentTimeMillis());

Preview.this.invalidate();

}

});

camera.startPreview();

previewing = true;

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

public boolean onTouch(View v, MotionEvent event) {

camera.takePicture(shutterCallback, rawCallback, jpegCallback);

return false;

}

// Called when shutter is opened

ShutterCallback shutterCallback = new ShutterCallback() {

public void onShutter() {

Log.d(TAG, "onShutter'd");

}

};

// Handles data for raw picture

PictureCallback rawCallback = new PictureCallback() {

public void onPictureTaken(byte[] data, Camera camera) {

Log.d(TAG, "onPictureTaken - raw");

}

};

// Handles data for jpeg picture

PictureCallback jpegCallback = new PictureCallback() {

public void onPictureTaken(byte[] data, Camera camera) {

FileOutputStream outStream = null;

try {

// Write to SD Card

outStream = new FileOutputStream(String.format("/sdcard/TVguide/Detection/detected.jpg", System.currentTimeMillis())); // <9>

outStream.write(data);

outStream.close();

Log.d(TAG, "onPictureTaken - wrote bytes: " + data.length);

} catch (FileNotFoundException e) { // <10>

//Toast.makeText(ctx, "Exception #2", Toast.LENGTH_LONG).show();

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

} finally {}

Log.d(TAG, "onPictureTaken - jpeg");

Toast.makeText(ctx, "SAVED", Toast.LENGTH_SHORT).show();

camera.startPreview();

}

};

}

请帮忙，我想了解几天没有成功的问题

的Eyal

2012-03-12

Eyal

+0

有人吗？我真的坚持 –

2012-03-14 20:52:10

+0

也我建议将图片保存到SD卡后台线程，而不是主要的UI线程。 –

2013-05-14 17:08:09