我正在开发一个自定义相机应用程序，并在两台galaxy平板电脑上进行测试。。一个7英寸和一个10英寸。。10英寸的效果很好，但在7英寸的相机上，当我拍照时，它会冻结相机预览，logCat会停止在camera SNAP，点击我的自定义相机类中的btn_SNAP_pic，没有错误。应用程序不会崩溃只是挂起。。如果我退出并再次打开应用程序，我会得到一个"无法连接到相机"的错误，我认为这个错误是因为当我的应用程序冻结并退出时，相机从未被释放。。无论如何，下面是我的CustomCamera类和我的CamLayer，这是我的预览。。
public class CustomCamera extends Activity{
String camFace ="back";
FrameLayout frame;
RelativeLayout rel;
CamLayer camPreview;
ImageView btn_snap_pic;
ImageView btn_switch_cam;
String TAG = "custom cam";
public void onCreate(Bundle savedInstanceState)
{
Bitmap btnSwitch = BitmapFactory.decodeResource(this.getResources(),
R.drawable.btn_switch_camera);
Bitmap btnSnap = BitmapFactory.decodeResource(this.getResources(),
R.drawable.btn_take_picture);
super.onCreate(savedInstanceState);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
//Set Screen Orientation
this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
RelativeLayout.LayoutParams buttonS = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
RelativeLayout.LayoutParams buttonT = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
RelativeLayout.LayoutParams cam = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
cam.addRule(RelativeLayout.BELOW);
buttonS.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
buttonT.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
buttonT.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
try{
//Create Intance of Camera
camPreview = new CamLayer(this.getApplicationContext(),camFace);
//Relative view for everything
rel = new RelativeLayout(this);
// set as main view
setContentView(rel);
//FrameLayOut for camera
frame = new FrameLayout(this);
// add Camera to view
frame.setLayoutParams(cam);
frame.addView(camPreview);
rel.addView(frame);
btn_switch_cam = new ImageView (this);
btn_switch_cam.setImageBitmap(btnSwitch);
btn_switch_cam.setLayoutParams(buttonS);
buttonS.rightMargin = 25;
buttonS.topMargin = 25;
rel.addView(btn_switch_cam);
btn_switch_cam.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Log.v("CAMERA Switch", "CLICKED");
//frame.removeView(camPreview);
if(camFace.equals("front")){
camFace = "back";
}else{
camFace = "front";
}
//camPreview.stopCamera();
frame.removeView(camPreview);
restartCam();
//camPreview.switchCam(camFace);
}
});
btn_snap_pic = new ImageView(this);
btn_snap_pic.setImageBitmap(btnSnap);
btn_snap_pic.setLayoutParams(buttonT);
buttonT.rightMargin = 25;
buttonT.bottomMargin = 25;
rel.addView(btn_snap_pic);
btn_snap_pic.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Log.v("CAMERA Snap", "CLICKED");
camPreview.camera.takePicture(shutterCallback, rawCallback,
jpegCallback);
}
});
} catch(Exception e){}
}
public void restartCam(){
camPreview = new CamLayer(this.getApplicationContext(),camFace);
frame.addView(camPreview);
}
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, android.hardware.Camera camera) {
Log.d(TAG, "onPictureTaken - raw");
}
};
/** Handles data for jpeg picture */
PictureCallback jpegCallback = new PictureCallback() {
public void onPictureTaken(byte[] data, android.hardware.Camera camera) {
FileOutputStream outStream = null;
try {
outStream = new FileOutputStream(String.format(
"/sdcard/LC/images/%d.jpg", System.currentTimeMillis()));
outStream.write(data);
outStream.close();
Log.d(TAG, "onPictureTaken - wrote bytes: " + data.length);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
}
Log.d(TAG, "onPictureTaken - jpeg");
}
};
}
和CAMLAYER:
public class CamLayer extends SurfaceView implements SurfaceHolder.Callback {
Camera camera;
SurfaceHolder previewHolder;
String camID;
private static final String TAG = "Cam Preview";
public CamLayer(Context context, String facing)
{
super(context);
camID = facing;
previewHolder = this.getHolder();
previewHolder.addCallback(this);
previewHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void surfaceCreated(SurfaceHolder holder) {
startCamera();
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height)
{
Parameters params = camera.getParameters();
//params.setPreviewSize(width, height);
//params.setPictureFormat(PixelFormat.JPEG);
camera.setParameters(params);
camera.startPreview();
}
public void surfaceDestroyed(SurfaceHolder arg0)
{
//camera.stopPreview();
//camera.release();
stopCamera();
}
public void onResume() {
//camera.startPreview();
startCamera();
}
public void onPause() {
// TODO Auto-generated method stub
//camera.stopPreview();
stopCamera();
}
public void switchCam(String newCamId) {
/*camera.stopPreview();
//camera.release();
if(camID.equals("front")){
camera.open(Camera.CameraInfo.CAMERA_FACING_FRONT);
}else{
camera.open(Camera.CameraInfo.CAMERA_FACING_BACK);
}*/
//camera.startPreview();
//camera=Camera.open(Camera.CameraInfo.CAMERA_FACING_BACK);
stopCamera();
camID = newCamId;
startCamera();
}
public void stopCamera(){
System.out.println("stopCamera method");
if (camera != null){
camera.stopPreview();
camera.setPreviewCallback(null);
camera.release();
camera = null;
previewHolder.removeCallback(this);
previewHolder = null;
}
}
private void startCamera(){
if(camID.equals("front")){
camera=Camera.open(Camera.CameraInfo.CAMERA_FACING_FRONT);
}else{
camera=Camera.open(Camera.CameraInfo.CAMERA_FACING_BACK);
}
try {
camera.setPreviewDisplay(previewHolder);
camera.setPreviewCallback(new PreviewCallback() {
public void onPreviewFrame(byte[] data, Camera arg1) {
//FileOutputStream outStream = null;
/*try {
//outStream = new FileOutputStream(String.format(
//"/sdcard/%d.jpg", System.currentTimeMillis()));
//outStream.write(data);
//outStream.close();
Log.d(TAG, "onPreviewFrame - wrote bytes: "
+ data.length);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
}*/
//CamLayer.this.invalidate();
}
});
}
catch (Throwable e){ Log.w("TAG,", "failed create surface !?!?"); }
}
public void draw(Canvas canvas) {
super.draw(canvas);
Paint p = new Paint(Color.RED);
Log.d(TAG, "draw");
canvas.drawText("PREVIEW", canvas.getWidth() / 2,
canvas.getHeight() / 2, p);
}
}
此线程表示不支持rawhttps://groups.google.com/forum/?fromgroups#！主题/安卓开发人员/D43DrbP9oE
我猜想，一个原始图像会消耗太多内存。除此之外，我也对它没有得到支持感到失望。