我正在制作一款可以显示预览和拍照的Android相机应用。此活动中有两个按钮：启动预览并停止预览。当用户点击停止预览按钮时，该应用程序将捕获照片。但是，当我测试我的应用程序时，与停止预览相关联的代码似乎被跳过而不执行。以下是我的代码：
SuppressWarnings("deprecation")
public class CameraOpened extends Activity implements SurfaceHolder.Callback{
Camera camera;
SurfaceView surfaceView;
SurfaceHolder surfaceHolder;
boolean previewing = false;
static final int REQUEST_IMAGE_CAPTURE = 1;
int count;
PictureCallback rawCallback;
ShutterCallback shutterCallback;
PictureCallback jpegCallback;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera_opened);
Button buttonStartCameraPreview = (Button)findViewById(R.id.startcamerapreview);
Button buttonStopCameraPreview = (Button)findViewById(R.id.stopcamerapreview);
getWindow().setFormat(PixelFormat.UNKNOWN);
surfaceView = (SurfaceView)findViewById(R.id.surfaceview);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
shutterCallback = new ShutterCallback() {
public void onShutter() {
Log.i("Log", "onShutter'd");
}
};
rawCallback = new PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
Log.d("Log", "onPictureTaken - raw");
}
};
jpegCallback = new PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
FileOutputStream outStream = null;
try {
String dir;
dir = Environment.getExternalStorageDirectory().toString() + "/DCIM/";
File newdir = new File(dir);
newdir.mkdirs();
File imageFileName = new File(newdir, "crop_"+ ".jpg");
outStream = new FileOutputStream(imageFileName);
outStream.write(data);
outStream.close();
Log.d("Log", "onPictureTaken - wrote bytes: " + data.length);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
}
Log.d("Log", "onPictureTaken - jpeg");
}
};
buttonStartCameraPreview.setOnClickListener(new Button.OnClickListener(){
public void onClick(View v) {
// TODO Auto-generated method stub
if(!previewing){
camera = Camera.open();
camera.setDisplayOrientation(90);
if (camera != null){
try {
camera.setPreviewDisplay(surfaceHolder);
camera.startPreview();
previewing = true;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}});
buttonStopCameraPreview.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(camera != null && previewing){
camera.takePicture(shutterCallback, rawCallback, jpegCallback);
previewing = false;
camera.stopPreview();
camera.release();
camera = null;
}
}});
}
public void savePhoto(Bitmap bmp)
{
String dir;
dir = Environment.getExternalStorageDirectory().toString() + "/DCIM/";
File newdir = new File(dir);
newdir.mkdirs();
FileOutputStream out = null;
//file name
Calendar c = Calendar.getInstance();
String date = fromInt(c.get(Calendar.MONTH))
+ fromInt(c.get(Calendar.DAY_OF_MONTH))
+ fromInt(c.get(Calendar.YEAR))
+ fromInt(c.get(Calendar.HOUR_OF_DAY))
+ fromInt(c.get(Calendar.MINUTE))
+ fromInt(c.get(Calendar.SECOND));
File imageFileName = new File(newdir, "crop_"+ ".jpg");
try
{
out = new FileOutputStream(imageFileName);
bmp.compress(Bitmap.CompressFormat.JPEG, 100, out);
out.flush();
out.close();
out = null;
} catch (Exception e)
{
e.printStackTrace();
}
}
public String fromInt(int val)
{
return String.valueOf(val);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.camera_opened, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
private void captureImage() {
// TODO Auto-generated method stub
//camera.takePicture(shutterCallback, rawCallback, jpegCallback);
}
}
以下是我的LogCat：
10-22 20:28:38.218: D/Camera(14375): [CTA] Camera open urrentpackagename = com.camera
10-22 20:28:38.218: D/Camera(14375): [CTA] Camera open application != null
10-22 20:28:38.218: D/Camera(14375): [CTA] check CTA permisson mAllowUsing = true
10-22 20:28:39.258: I/Choreographer(14375): Skipped 61 frames! The application may be doing too much work on its main thread.
10-22 20:28:49.318: D/Camera(14375): [CTA] Camera open urrentpackagename = com.camera
10-22 20:28:49.318: D/Camera(14375): [CTA] Camera open application != null
10-22 20:28:49.318: D/Camera(14375): [CTA] check CTA permisson mAllowUsing = true
10-22 20:28:53.028: I/Choreographer(14375): Skipped 77 frames! The application may be doing too much work on its main thread.
关于如何解决这个问题的任何想法？