Today I had faced an issue in android surfaceview for camera customization
.
I tried the below code.
The Issue occurred when I captured the image, it stops the camera preview and doesn't return to the activity.
Following code will be implemented in the program. I took this code from an existing reference on stackoverflow
Supporting Class.
public class AndroidCameraSurfaceview extends Activity implements
SurfaceHolder.Callback {
TextView testView;
Camera camera;
SurfaceView surfaceView;
SurfaceHolder surfaceHolder;
boolean preview;
PictureCallback rawCallback;
ShutterCallback shutterCallback;
PictureCallback jpegCallback;
int displayheight, displaywidth;
Camera.PreviewCallback previewCallback;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.camerasurfaceview);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
surfaceView = (SurfaceView) findViewById(R.id.surfaceView);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
jpegCallback = new PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
Bundle b = new Bundle();
b.putByteArray("Image", data);
Intent intent = new Intent();
intent.putExtras(b);
setResult(RESULT_OK, intent);
finish();
// refreshCamera();
}
};
}
public void captureImage(View v) throws IOException {
// take the picture
camera.takePicture(null, null, jpegCallback);
}
public void refreshCamera() {
if (surfaceHolder.getSurface() == null) {
// preview surface does not exist
return;
}
try {
camera.stopPreview();
} catch (Exception e) {
}
try {
camera.setDisplayOrientation(90);
camera.setPreviewDisplay(surfaceHolder);
camera.startPreview();
} catch (Exception e) {
}
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
if (preview) {
camera.stopPreview();
}
try{
Camera.Parameters parameters = camera.getParameters();
List<Size> sizes = parameters.getSupportedPreviewSizes();
Size optimalSize = getOptimalPreviewSize(sizes, width, height);
parameters.setPreviewSize(optimalSize.width, optimalSize.height);
camera.setParameters(parameters);
try {
camera.setDisplayOrientation(90);
camera.setPreviewDisplay(holder);
camera.startPreview();
preview = true;
} catch (IOException e) {
e.printStackTrace();
}
}catch(Exception e){
System.out.println("Surface Exception---=>"+e);
}
}
public void surfaceCreated(SurfaceHolder holder) {
camera = Camera.open();
if (camera != null) {
Camera.Parameters params = camera.getParameters();
camera.setDisplayOrientation(90);
camera.setParameters(params);
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
// stop preview and release camera
camera.stopPreview();
camera.release();
camera = null;
}
private Size getOptimalPreviewSize(List<Size> sizes, int w, int h) {
final double ASPECT_TOLERANCE = 1;
double targetRatio = (double) w / h;
if (sizes == null)
return null;
Size optimalSize = null;
double minDiff = Double.MAX_VALUE;
int targetHeight = h;
for (Size size : sizes) {
double ratio = (double) size.width / size.height;
if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE)
continue;
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
if (optimalSize == null) {
minDiff = Double.MAX_VALUE;
for (Size size : sizes) {
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
}
return optimalSize;
}
}
2.Implemented in Activity
public void captureImage() {
Intent intentDriver = new Intent(AddNewDevice_Activity.this,
AndroidCameraSurfaceview.class);
startActivityForResult(intentDriver, 0);
//
// Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
//
// Uri fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
//
// intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
//
// // start the image capture Intent
// startActivityForResult(intent, CAMERA_CAPTURE_IMAGE_REQUEST_CODE);
// Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
//
// fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
//
// intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
//
// // start the image capture Intent
// startActivityForResult(intent, CAMERA_CAPTURE_IMAGE_REQUEST_CODE);
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 0) {
System.out.println("Result Code: " + resultCode);
if (resultCode == RESULT_OK && data != null) {
Bundle bundle = data.getExtras();
byte[] test = bundle.getByteArray("Image");
Bitmap bpCamera = BitmapFactory.decodeByteArray(test, 0,
test.length);
Matrix matrix = new Matrix();
matrix.postRotate(90);
bpCamera = Bitmap
.createBitmap(bpCamera, 0, 0, bpCamera.getWidth(),
bpCamera.getHeight(), matrix, true);
imageView_camera.setImageBitmap(bpCamera);
selectedImageStr = encodeTobase64(bpCamera);
}
} else {
finish();
}
}
Provides a dedicated drawing surface embedded inside of a view hierarchy. You can control the format of this surface and, if you like, its size; the SurfaceView takes care of placing the surface at the correct location on the screen.
The expression deviceOrientationDegrees * sign + 360 converts device rotation from counterclockwise to clockwise for back-facing cameras (for example, converting 270 degrees counterclockwise to 90 degrees clockwise).
PreviewView — Implementation modes To display the camera feed, it uses either a SurfaceView or TextureView , provides a preview surface to the camera when it's ready, tries to keep it valid as long as the camera is using it, and when released prematurely, provides a new surface if the camera is still in use.
You shold split activity and surface view.
public class AndroidCameraActivity extends Activity {
AndroidCameraSurfaceview surfaceView;
...
@Override
public void onCreate(Bundle savedInstanceState) {
...
surfaceView = (AndroidCameraSurfaceview) findViewById(R.id.surfaceView);
}
}
class AndroidCameraSurfaceview extends SurfaceView implements SurfaceHolder.Callback {
public AndroidCameraSurfaceview(Context context, AttributeSet attrs) {
super(context, attrs);
getHolder().addCallback(this);
...
}
public void surfaceCreated(SurfaceHolder holder) {
...
}
public void surfaceDestroyed(SurfaceHolder holder) {
...
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
...
}
}
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