I am using the following code to take a picture and then display it on screen to the user using an ImageView. I want the picture to be displayed fullscreen (like on snapchat). However, the picture is always displayed like this horizontally with a white screen everywhere else: 
This is my layout:
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<FrameLayout
android:id="@+id/camera_view"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:visibility="gone"
android:id="@+id/picturedisplay"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imgClose"
android:layout_gravity="right|bottom"
android:text="Flip Cam"
android:padding="20dp"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/snap"
android:text="Capture"
android:layout_gravity="center|bottom"
android:padding="20dp"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Flash"
android:id="@+id/imgOpen"
android:layout_gravity="left|bottom"
android:padding="20dp"/>
and the code:
public class CameraScreen extends Activity {
private Camera mCamera = null;
private SessionManager session;
private String rand_img;
private ImageView preview_pic;
private Bitmap bitmap;
private CameraPreview mCameraView = null;
private byte[] photo;
static final int CAM_REQUEST = 1;
private RandomString randomString = new RandomString(10);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera_screen);
session = new SessionManager(getApplicationContext());
try {
mCamera = Camera.open();//you can use open(int) to use different cameras
} catch (Exception e) {
Log.d("ERROR", "Failed to get camera: " + e.getMessage());
}
if (mCamera != null) {
mCameraView = new CameraPreview(this, mCamera);//create a SurfaceView to show camera data
FrameLayout camera_view = (FrameLayout) findViewById(R.id.camera_view);
camera_view.addView(mCameraView);//add the SurfaceView to the layout
}
//btn to close the application
Button imgClose = (Button) findViewById(R.id.imgClose);
imgClose.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
System.exit(0);
}
});
//btn to close the application
Button logout = (Button) findViewById(R.id.imgOpen);
logout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
session.logOut();
Intent a = new Intent(CameraScreen.this, MainActivity.class);
startActivity(a);
finish();
}
});
Button snap = (Button) findViewById(R.id.snap);
snap.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mCamera.takePicture(shutterCallback, rawCallback, jpegCallback);
}
});
}
@Override
protected void onPause() {
super.onPause();
if (mCamera != null) {
mCamera.setPreviewCallback(null);
mCameraView.getHolder().removeCallback(mCameraView);
mCamera.release();
}
}
@Override
public void onResume() {
super.onResume();
// Get the Camera instance as the activity achieves full user focus
if (mCamera == null) {
initializeCamera(); // Local method to handle camera initialization
}
}
protected void initializeCamera(){
// Get an instance of Camera Object
try{
mCamera = Camera.open();//you can use open(int) to use different cameras
} catch (Exception e){
Log.d("ERROR", "Failed to get camera: " + e.getMessage());
}
if(mCamera != null) {
mCameraView = new CameraPreview(this, mCamera);//create a SurfaceView to show camera data
FrameLayout camera_view = (FrameLayout)findViewById(R.id.camera_view);
camera_view.addView(mCameraView);//add the SurfaceView to the layout
}
}
private File getFile() {
File sdCard = Environment.getExternalStorageDirectory();
File folder = new File(sdCard.getAbsolutePath() +"/city_life_pic");
if (!folder.exists()) {
folder.mkdir();
}
rand_img = randomString.nextString() + ".jpg";
File image = new File(folder,rand_img);
return image;
}
Camera.ShutterCallback shutterCallback = new Camera.ShutterCallback() {
public void onShutter() {
Log.d("ON SHUTTER", "onShutter'd");
}
};
Camera.PictureCallback rawCallback = new Camera.PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
Log.d("ON PICTURE RAW", "onPictureTaken - raw");
}
};
Camera.PictureCallback jpegCallback = new Camera.PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
photo = data;
new SaveImageTask().execute(data);
Log.d("ON PICTURE JPEG", "onPictureTaken - jpeg");
}
};
private class SaveImageTask extends AsyncTask<byte[], Void, Void> {
@Override
protected Void doInBackground(byte[]... data) {
FileOutputStream outStream = null;
// Write to SD Card
try {
bitmap = decodeByteArray(photo, 0, photo.length);
File outFile = getFile();
outStream = new FileOutputStream(outFile);
outStream.write(data[0]);
ExifInterface exif=new ExifInterface(outFile.toString());
Log.d("EXIF value", exif.getAttribute(ExifInterface.TAG_ORIENTATION));
if(exif.getAttribute(ExifInterface.TAG_ORIENTATION).equalsIgnoreCase("6")){
bitmap= rotate(bitmap, 90);
} else if(exif.getAttribute(ExifInterface.TAG_ORIENTATION).equalsIgnoreCase("8")){
bitmap= rotate(bitmap, 270);
} else if(exif.getAttribute(ExifInterface.TAG_ORIENTATION).equalsIgnoreCase("3")){
bitmap= rotate(bitmap, 180);
} else if(exif.getAttribute(ExifInterface.TAG_ORIENTATION).equalsIgnoreCase("0")){
bitmap= rotate(bitmap, 90);
}
boolean bo = bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outStream);
outStream.flush();
outStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
}
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
FrameLayout camera_view = (FrameLayout)findViewById(R.id.camera_view);
preview_pic = (ImageView) findViewById(R.id.picturedisplay);
camera_view.setVisibility(View.GONE);
preview_pic.setVisibility(View.VISIBLE);
preview_pic.setImageBitmap(bitmap);
}
}
public static Bitmap rotate(Bitmap bitmap, int degree) {
int w = bitmap.getWidth();
int h = bitmap.getHeight();
Matrix mtx = new Matrix();
// mtx.postRotate(degree);
mtx.setRotate(degree);
return Bitmap.createBitmap(bitmap, 0, 0, w, h, mtx, true);
}
}
EDIT ROTATION CODE:
switch (rotation)
{
case Surface.ROTATION_0:
degrees = 0;
break;
case Surface.ROTATION_90:
degrees = 90;
break;
case Surface.ROTATION_180:
degrees = 180;
break;
case Surface.ROTATION_270:
degrees = 270;
break;
}
if (currentCamInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
//switch camera to back camera
mCamera = Camera.open(camBackId);
result = (currentCamInfo.orientation + degrees) % 360;
result = (360 - result) % 360; // compensate the mirror
} else {
//switch camera to front camera
mCamera = Camera.open(camFrontId);
result = (currentCamInfo.orientation - degrees + 360) % 360;
}
if (mCamera != null) {
mCamera.setDisplayOrientation(result);
//rotate camera
mCameraView = new CameraPreview(this, mCamera);//create a SurfaceView to show camera data
camera_view.addView(mCameraView);//add the SurfaceView to the layout
Camera.Parameters p = mCamera.getParameters();
p.setRotation(90);
mCamera.setParameters(p);
}
