Related
I've used CameraPageRenderer where there is no implementation of AutoFocus. I don't know how to implement it in Xamarin Android.
public async void OnSurfaceTextureAvailable(SurfaceTexture surface, int width, int height)
{
camera = global::Android.Hardware.Camera.Open((int)cameraType);
textureView.LayoutParameters = new FrameLayout.LayoutParams(width, height);
surfaceTexture = surface;
camera.SetPreviewTexture(surface);
PrepareAndStartCamera();
}
From CameraPageRenderer, setup the "Focus Mode" in the Camera properties by implementing IAutoFocusCallback in CameraPageRenderer.
public class CameraPageRenderer : PageRenderer, TextureView.ISurfaceTextureListener, IAutoFocusCallback
{
Then implementing OnAutoFocus method, setting AutoFocus.
public void OnAutoFocus(bool success, Camera camera)
{
var parameters = camera.GetParameters();
if (parameters.FocusMode != Android.Hardware.Camera.Parameters.FocusModeContinuousPicture)
{
parameters.FocusMode = Android.Hardware.Camera.Parameters.FocusModeContinuousPicture;
if (parameters.MaxNumFocusAreas > 0)
{
parameters.FocusAreas = null;
}
camera.SetParameters(parameters);
camera.StartPreview();
}
}
Update:
I following this thread(How to implement visual indicator when camera is focused), to add AutoFocus for CameraPageRenderer.
private void TextureView_Touch(object sender, TouchEventArgs e)
{
if (camera != null)
{
var parameters = camera.GetParameters();
camera.CancelAutoFocus();
Rect focusRect = CalculateTapArea(e.Event.GetX(), e.Event.GetY(), 1f);
if (parameters.FocusMode != Android.Hardware.Camera.Parameters.FocusModeAuto)
{
parameters.FocusMode = Android.Hardware.Camera.Parameters.FocusModeAuto;
}
if (parameters.MaxNumFocusAreas > 0)
{
List<Area> mylist = new List<Area>();
mylist.Add(new Android.Hardware.Camera.Area(focusRect, 1000));
parameters.FocusAreas = mylist;
}
try
{
camera.CancelAutoFocus();
camera.SetParameters(parameters);
camera.StartPreview();
camera.AutoFocus(this);
MarginLayoutParams margin = new MarginLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WrapContent,
ViewGroup.LayoutParams.WrapContent));
margin.SetMargins(focusRect.Left, focusRect.Top,
focusRect.Right, focusRect.Bottom);
FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams(margin);
layoutParams.Height = 200;
layoutParams.Width = 200;
takePhotoButton.LayoutParameters = layoutParams;
takePhotoButton.Visibility = ViewStates.Visible;
}
catch (System.Exception ex)
{
Console.WriteLine(ex.ToString());
Console.Write(ex.StackTrace);
}
//return true;
}
else
{
//return false;
}
}
private Rect CalculateTapArea(object x, object y, float coefficient)
{
var focusAreaSize = Math.Max(textureView.Width, textureView.Height) / 8; //Recommended focus area size from the manufacture is 1/8 of the image
int areaSize = focusAreaSize * (int)coefficient;
int left = clamp(Convert.ToInt32(x) - areaSize / 2, 0, textureView.Width - areaSize);
int top = clamp(Convert.ToInt32(y) - areaSize / 2, 0, textureView.Height - areaSize);
RectF rectF = new RectF(left, top, left + areaSize, top + areaSize);
Matrix.MapRect(rectF);
return new Rect((int)System.Math.Round(rectF.Left), (int)System.Math.Round(rectF.Top), (int)System.Math.Round(rectF.Right), (int)System.Math.Round(rectF.Bottom));
}
private int clamp(int x, int min, int max)
{
if (x > max)
{
return max;
}
if (x < min)
{
return min;
}
return x;
}
public void OnAutoFocus(bool success, Camera camera)
{
var parameters = camera.GetParameters();
if (parameters.FocusMode != Android.Hardware.Camera.Parameters.FocusModeContinuousPicture)
{
parameters.FocusMode = Android.Hardware.Camera.Parameters.FocusModeContinuousPicture;
if (parameters.MaxNumFocusAreas > 0)
{
parameters.FocusAreas = null;
}
camera.SetParameters(parameters);
camera.StartPreview();
}
if(success)
{
Task.Delay(1000);
this.takePhotoButton.Visibility = ViewStates.Invisible;
}
}
Update:
If you're using the Camera API 1 (the old one) you can set the focus mode to continuous like this:
public void OnSurfaceTextureAvailable(SurfaceTexture surface, int width, int height)
{
try
{
var camera = Camera.Open((int)cameraType);
var parameters = camera.GetParameters();
//SET FOCUS MODE HERE
parameters.FocusMode = Camera.Parameters.FocusModeContinuousPicture;
camera.SetParameters(parameters);
}
catch (Exception ex)
{
//log error
return;
}
//other code related to the camera
textureView.LayoutParameters = new FrameLayout.LayoutParams(width, height);
surfaceTexture = surface;
camera.SetPreviewTexture(surface);
PrepareAndStartCamera();
}
Im trying to use camera 2 with and AutoFitTextureView from the google sample.
Im setting it up like this
private void setUpCameraOutputs() {
CameraManager manager = (CameraManager) mContext.getSystemService(Context.CAMERA_SERVICE);
try {
if (manager != null) {
for (String cameraId : manager.getCameraIdList()) {
CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraId);
// We don't use a front facing camera in this sample.
//noinspection ConstantConditions
if (characteristics.get(LENS_FACING) == LENS_FACING_FRONT) continue;
StreamConfigurationMap map = characteristics.get(SCALER_STREAM_CONFIGURATION_MAP);
if(map != null) {
// For still image captures, we use the largest available size.
List<Size> outputSizes = Arrays.asList(map.getOutputSizes(sImageFormat));
Size largest = Collections.max(outputSizes, new CompareSizesByArea());
mImageReader = ImageReader.newInstance(640, 480, sImageFormat, 8);
mImageReader.setOnImageAvailableListener(mOnImageAvailableListener, mBackgroundHandler);
// Danger, W.R.! Attempting to use too large a preview size could exceed the camera
// bus' bandwidth limitation, resulting in gorgeous previews but the storage of
// garbage capture data.
mPreviewSize = chooseOptimalSize(map.getOutputSizes(SurfaceTexture.class), largest.getWidth(), largest.getHeight(), largest);
//mPreviewSize = new Size(largest.getWidth(), largest.getHeight());
setAspectRatio2(mPreviewSize);
Logging.e(TAG, "WIDTH: " + mPreviewSize.getWidth() + " HEIGHT: " + mPreviewSize.getHeight());
mCameraId = cameraId;
}
//return;
}
}else{
Logging.e(TAG,"No Manager");
}
} catch (Exception e) {
e.printStackTrace();
}
}
private void setAspectRatio(){
int orientation = mContext.getResources().getConfiguration().orientation;
if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
mTextureView.setAspectRatio(mPreviewSize.getWidth(),mPreviewSize.getHeight());
} else {
mTextureView.setAspectRatio(mPreviewSize.getHeight(),mPreviewSize.getWidth());
}
}
private void setAspectRatio2(Size largest){
float cameraAspectRatio = (float) largest.getHeight() / largest.getWidth();
//Preparation
DisplayMetrics metrics = new DisplayMetrics();
WindowManager wm = ((WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE));
wm.getDefaultDisplay().getMetrics(metrics);
int screenWidth = metrics.widthPixels;
int screenHeight = metrics.heightPixels;
int finalWidth = screenWidth;
int finalHeight = screenHeight;
int widthDifference = 0;
int heightDifference = 0;
float screenAspectRatio = (float) screenWidth / screenHeight;
//Determines whether we crop width or crop height
if (screenAspectRatio > cameraAspectRatio) { //Keep width crop height
finalHeight = (int) (screenWidth / cameraAspectRatio);
heightDifference = finalHeight - screenHeight;
} else { //Keep height crop width
finalWidth = (int) (screenHeight * cameraAspectRatio);
widthDifference = finalWidth - screenWidth;
}
//Apply the result to the Preview
LayoutParams lp = (FrameLayout.LayoutParams) mTextureView.getLayoutParams();
lp.width = finalWidth;
lp.height = finalHeight;
//Below 2 lines are to center the preview, since cropping default occurs at the right and bottom
lp.leftMargin = - (widthDifference / 2);
lp.topMargin = - (heightDifference / 2);
mTextureView.setLayoutParams(lp);
}
private static Size chooseOptimalSize(Size[] choices, int width, int height, Size aspectRatio) {
// Collect the supported resolutions that are at least as big as the preview Surface
List<Size> bigEnough = new ArrayList<>();
int w = aspectRatio.getWidth();
int h = aspectRatio.getHeight();
double ratio = (double) h / w;
for (Size option : choices) {
double optionRatio = (double) option.getHeight() / option.getWidth();
if (ratio == optionRatio) {
bigEnough.add(option);
}
}
// Pick the smallest of those, assuming we found any
if (bigEnough.size() > 0) {
return Collections.min(bigEnough, new CompareSizesByArea());
} else {
Logging.e(TAG, "Couldn't find any suitable preview size");
return choices[1];
}
}
I've tried to set the aspect ratio with 2 different methods, but none of them seem to do what i need.
The preview takes all screen as i want, but camera preview always appear streeched, things look thiner.
I've tried a few sugestions from stackoverflow but still haven't got the perfect result.
There are a lot of libraries which ease the use of CameraView.
You can have a look at this one or this one for example.
I want to control my simple android game (arcanoid) with accelerometer. Paddle in game is now being controlled with touch screen event. I want to control it with accelerometer.
I tried to implement accelerometer into GameActivity class which is "controlling" BreakOutView class like this:
public class GameActivity extends Activity implements SensorEventListener {
// gameView will be the view of the Menu_Layout
// It will also hold the logic of the Menu_Layout
// and respond to screen touches as well
BreakOutView breakoutView;
private SensorManager sManager;
Sensor accelerometer;
Paddle paddle;
float x;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
breakoutView = new BreakOutView(this);
sManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE); // zisk managera
if (sManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER) != null) {
accelerometer = sManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
sManager.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_NORMAL);
}
// Initialize gameView and set it as the view
setContentView(breakoutView);
}
// This method executes when the player starts the Game
#Override
protected void onResume() {
super.onResume();
sManager.registerListener(this,accelerometer,SensorManager.SENSOR_DELAY_NORMAL);
// Tell the gameView resume method to execute
breakoutView.resume();
}
// This method executes when the player quits the Menu_Layout
#Override
protected void onPause() {
super.onPause();
sManager.unregisterListener(this);
// Tell the gameView pause method to execute
breakoutView.pause();
}
#Override
public void onSensorChanged(SensorEvent sensorEvent) {
if (sensorEvent.sensor.getType() == Sensor.TYPE_ACCELEROMETER)
{
x = sensorEvent.values[0];
if (x > 0) {
breakoutView.paddle.setMovementState(paddle.LEFT);
}
else { breakoutView.paddle.setMovementState(paddle.RIGHT);
}
}
}
#Override
public void onAccuracyChanged(Sensor sensor, int i) {
}
}
This is code for BreakOutView class.
onTouchEvent method is now disabled because I want to use accelerometer to control Paddle in application.
public class BreakOutView extends SurfaceView implements Runnable{
// This is our thread
Thread gameThread = null;
// This is new. We need a SurfaceHolder
// When we use Paint and Canvas in a thread
// We will see it in action in the draw method soon.
SurfaceHolder ourHolder;
// A boolean which we will set and unset
// when the Menu_Layout is running- or not.
volatile boolean playing;
// Game is paused at the start
boolean paused = true;
// A Canvas and a Paint object
Canvas canvas;
Paint paint;
// This variable tracks the Menu_Layout frame rate
long fps;
Bitmap bitmapBob;
Bitmap bitmapBall;
Bitmap bitmapPaddal;
Bitmap bitmapBrick1;
Bitmap bitmapBrick2;
Bitmap bitmapBrick3;
// The size of the screen in pixels
int screenX;
int screenY;
// The players paddle
Paddle paddle;
// A ball
Ball ball;
// Up to 200 bricks
Brick[] bricks = new Brick[24];
int numBricks = 0;
// For sound FX
SoundPool soundPool;
int beep1ID = -1;
int beep2ID = -1;
int beep3ID = -1;
int loseLifeID = -1;
int explodeID = -1;
// The score
int score = 0;
int level = 1;
// Lives
int lives = 3;
Rect dest;
DisplayMetrics dm;
int densityDpi;
// When we initialize (call new()) on BreakOutView
// This special constructor method runs
public BreakOutView(Context context) {
super(context);
// The next line of code asks the
// SurfaceView class to set up our object.
// How kind.
// Initialize ourHolder and paint objects
ourHolder = getHolder();
paint = new Paint();
// Get a Display object to access screen details
WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
// Load the resolution into a Point object
Point size = new Point();
// TODO target API < 13
display.getSize(size);
screenX = size.x;
screenY = size.y;
// using dpi to set sizes for objects
dm = context.getResources().getDisplayMetrics();
densityDpi = dm.densityDpi;
paddle = new Paddle(screenX, screenY, densityDpi);
// Create a ball
ball = new Ball(screenX, screenY);
// Load the sounds
// This SoundPool is deprecated but don't worry
soundPool = new SoundPool(10, AudioManager.STREAM_MUSIC, 0);
try {
// Create objects of the 2 required classes
AssetManager assetManager = context.getAssets();
AssetFileDescriptor descriptor;
// Load our fx in memory ready for use
descriptor = assetManager.openFd("beep1.wav");
beep1ID = soundPool.load(descriptor, 0);
descriptor = assetManager.openFd("beep2.wav");
beep2ID = soundPool.load(descriptor, 0);
descriptor = assetManager.openFd("beep3.wav");
beep3ID = soundPool.load(descriptor, 0);
descriptor = assetManager.openFd("loseLife.wav");
loseLifeID = soundPool.load(descriptor, 0);
descriptor = assetManager.openFd("explode.wav");
explodeID = soundPool.load(descriptor, 0);
} catch (IOException e) {
// Print an error message to the console
Log.e("error", "failed to load sound files");
}
// Load Images from resource files
bitmapBob = BitmapFactory.decodeResource(this.getResources(), R.drawable.wall);
bitmapBall = BitmapFactory.decodeResource(this.getResources(), R.drawable.ball);
bitmapPaddal = BitmapFactory.decodeResource(this.getResources(), R.drawable.ball);
bitmapBrick1 = BitmapFactory.decodeResource(this.getResources(), R.drawable.brick_red);
bitmapBrick2 = BitmapFactory.decodeResource(this.getResources(), R.drawable.brick_green);
bitmapBrick3 = BitmapFactory.decodeResource(this.getResources(), R.drawable.brick_monster);
//Make Sizes Depending on DPI
int heightX = densityDpi / 8;
float length_Paddal = densityDpi / 1.50f;
int height_Paddal = densityDpi / 7;
int brickWidth = screenX / 8;
int brickHeight = screenY / 10;
bitmapBall = getResizedBitmap(bitmapBall, heightX, heightX);
bitmapPaddal = getResizedBitmap(bitmapPaddal, length_Paddal, height_Paddal);
bitmapBrick1 = getResizedBitmap(bitmapBrick1, brickWidth, brickHeight);
bitmapBrick2 = getResizedBitmap(bitmapBrick2, brickWidth, brickHeight);
bitmapBrick3 = getResizedBitmap(bitmapBrick3, brickWidth, brickHeight);
// Create bricks for level 1
createBricksAndRestart(1);
}
public void createBricksAndRestart(int Xlevel) {
// Put the ball back to the start
ball.reset(screenX, screenY);
level = Xlevel;
switch (Xlevel) {
case 2:
// level 2
ball.xVelocity = 600;
ball.yVelocity = -1000;
break;
// level 3
case 3:
ball.xVelocity = 1000;
ball.yVelocity = -1400;
break;
// level 1
default:
ball.xVelocity = 400;
ball.yVelocity = -800;
break;
}
// Brick Size
int brickWidth = screenX / 8;
int brickHeight = screenY / 10;
// Build a wall of bricks
numBricks = 0;
for (int column = 0; column < 8; column++) {
for (int row = 0; row < 3; row++) {
bricks[numBricks] = new Brick(row, column, brickWidth, brickHeight);
numBricks++;
}
}
// if Game is over reset scores ,lives &Level
if (lives == 0) {
score = 0;
lives = 3;
level = 1;
}
}
#Override
public void run() {
while (playing) {
// Capture the current time in milliseconds in startFrameTime
long startFrameTime = System.currentTimeMillis();
// Update the frame
if (!paused) {
update();
}
// Draw the frame
draw();
// Calculate the fps this frame
// We can then use the result to
// time animations and more.
long timeThisFrame = System.currentTimeMillis() - startFrameTime;
if (timeThisFrame >= 1) {
fps = 1000 / timeThisFrame;
}
}
}
// Everything that needs to be updated goes in here
// Movement, collision detection etc.
public void update() {
// Move the paddle if required
paddle.update(fps);
ball.update(fps);
// Check for ball colliding with a brick
for (int i = 0; i < numBricks; i++) {
if (bricks[i].getVisibility()) {
if (RectF.intersects(bricks[i].getRect(), ball.getRect())) {
bricks[i].setInvisible();
ball.reverseYVelocity();
score = score + 10;
soundPool.play(explodeID, 1, 1, 0, 0, 1);
}
}
}
// Check for ball colliding with paddle
if (
ball.getRect().intersect(paddle.getRect()) ||
RectF.intersects(paddle.getRect(), ball.getRect()) ||
paddle.getRect().intersect(ball.getRect())
) {
ball.reverseYVelocity();
// ReverseX Direction + IncreaseX speed
if (paddle.getMovementState() == paddle.RIGHT && ball.xVelocity < 0 || paddle.getMovementState() == paddle.LEFT && ball.xVelocity > 0) {
ball.reverseXVelocity();
}
// SameX Direction + IncreaseX speed
else if (paddle.getMovementState() == paddle.RIGHT && ball.xVelocity > 0 || paddle.getMovementState() == paddle.LEFT && ball.xVelocity < 0) {
ball.sameXVelocity();
}
/*// Paddle is still, DecreaseX speed
else if (paddle.getMovementState() == paddle.STOPPED) {
ball.zeroXVelocity();
}*/
// Some intersection Bugs
ball.clearObstacleY(paddle.getRect().top - 20);
soundPool.play(beep1ID, 1, 1, 0, 0, 1);
}
// Bounce the ball back when it hits the bottom of screen
// And Lose a life
if (ball.getRect().bottom > screenY) {
ball.reverseYVelocity();
ball.clearObstacleY(screenY - 5);
// Lose a life
lives--;
soundPool.play(loseLifeID, 1, 1, 0, 0, 1);
if (lives == 0) {
paused = true;
//draw Loss;
canvas = ourHolder.lockCanvas();
paint.setColor(getResources().getColor(R.color.orange));
paint.setTextSize(getResources().getDimension(R.dimen.text_size_big));
canvas.drawText("أنت خسرت!",
screenX / 2 - (densityDpi / 1.90f), screenY / 2 + (densityDpi), paint);
ourHolder.unlockCanvasAndPost(canvas);
try {
// Wait 3 seconds then reset a new game
Thread.sleep(3000);
} catch (InterruptedException e) {
e.printStackTrace();
}
// Create bricks at level 1
createBricksAndRestart(1);
}
}
// Pause if cleared screen
if (score == numBricks * 10) {
// Create bricks at level 2
createBricksAndRestart(2);
// fix for a pause bug
// so that it won't Pause After finishing the Game
score = score + 10;
// Gift the player with 1 new live
lives = lives + 1;
} else if (score == (numBricks * 20) + 10) {
// Create bricks at level 3
createBricksAndRestart(3);
// fix for a pause bug
// so that it won't Pause After finishing the Game
score = score + 10;
// Gift the player with 2 new lives
lives = lives + 2;
}
// Pause if cleared screen
// if score equals to the whole Bricks scores after 3 levels
else if (score == (numBricks * 10 * 3) + 20) {
paused = true;
}
// Bounce the ball back when it hits the top of screen
if (ball.getRect().top < 0) {
ball.reverseYVelocity();
ball.clearObstacleY(40);
soundPool.play(beep2ID, 1, 1, 0, 0, 1);
}
// If the ball hits left wall bounce
if (ball.getRect().left < 0) {
ball.reverseXVelocity();
ball.clearObstacleX(2);
soundPool.play(beep3ID, 1, 1, 0, 0, 1);
}
// If the ball hits right wall Velocity
if (ball.getRect().right > screenX) {
ball.reverseXVelocity();
ball.clearObstacleX(screenX - 57);
soundPool.play(beep3ID, 1, 1, 0, 0, 1);
}
}
// Draw the newly updated scene
public void draw() {
// Make sure our drawing surface is valid or we crash
if (ourHolder.getSurface().isValid()) {
// Lock the canvas ready to draw
canvas = ourHolder.lockCanvas();
// Draw the background color
// canvas.drawColor(getResources().getColor(R.color.deeppurple));
dest = new Rect(0, 0, getWidth(), getHeight());
// Draw bob as background with dest size
canvas.drawBitmap(bitmapBob, null, dest, paint);
// Choose the brush color for drawing
paint.setColor(Color.argb(255, 255, 255, 255));
// Draw the ball
// canvas.drawCircle(ball.getRect().centerX(), ball.getRect().centerY(), 25, paint);
canvas.drawBitmap(bitmapBall, ball.getRect().left, ball.getRect().top, null);
// Draw the paddle
//canvas.drawRect(paddle.getRect(), paint);
canvas.drawBitmap(bitmapPaddal, paddle.getRect().left, paddle.getRect().top, null);
// Change the brush color for drawing
// paint.setColor(getResources().getColor(R.color.redorange));
// Draw the bricks if visible
for (int i = 0; i < numBricks; i++) {
if (bricks[i].getVisibility()) {
// canvas.drawRect(bricks[i].getRect(), paint);
switch (level) {
case 1:
canvas.drawBitmap(bitmapBrick1, bricks[i].getRect().left, bricks[i].getRect().top, null);
break;
case 2:
canvas.drawBitmap(bitmapBrick2, bricks[i].getRect().left, bricks[i].getRect().top, null);
break;
case 3:
canvas.drawBitmap(bitmapBrick3, bricks[i].getRect().left, bricks[i].getRect().top, null);
break;
}
}
}
// Choose the brush color for drawing
paint.setColor(Color.argb(255, 255, 255, 255));
// Draw the score
paint.setTextSize(getResources().getDimension(R.dimen.text_size));
// Score Text
canvas.drawText(
"النقاط: " + score
, screenX - (densityDpi / 1.50f), screenY / 2, paint);
// Lives Text
canvas.drawText("الصحة: " + lives
, densityDpi / 5, screenY / 2, paint);
// Levels Text
canvas.drawText("المرحلة: " + level
, screenX / 2 - (densityDpi / 5), screenY / 2 + (densityDpi / 5), paint);
// Has the player cleared the screen?
if (score >= (numBricks * 10 * 3) + 20) {
paint.setColor(getResources().getColor(R.color.colorAccent));
paint.setTextSize(getResources().getDimension(R.dimen.text_size_big));
canvas.drawText("أنت كسبت!", screenX / 2 - (densityDpi / 1.90f), screenY / 2 + (densityDpi / 1), paint);
}
// Draw everything to the screen
ourHolder.unlockCanvasAndPost(canvas);
}
}
// If GameActivity is paused/stopped
// shutdown our thread.
public void pause() {
playing = false;
try {
gameThread.join();
} catch (InterruptedException e) {
Log.e("Error:", "joining thread");
}
}
// If GameActivity is started
// start our thread.
public void resume() {
playing = true;
gameThread = new Thread(this);
gameThread.start();
}
// The SurfaceView class implements onTouchListener
// So we can override this method and detect screen touches.
/* #Override
public boolean onTouchEvent(MotionEvent motionEvent) {
switch (motionEvent.getAction() & MotionEvent.ACTION_MASK) {
// Player has touched the screen
case MotionEvent.ACTION_DOWN:
if (!(lives == 0)) {
paused = false;
}
// If touch motion > Half of the Screen
if (motionEvent.getX() > screenX / 2) {
// move paddle right
paddle.setMovementState(paddle.RIGHT);
} else {
// move paddle left
paddle.setMovementState(paddle.LEFT);
}
break;
// Player has removed finger from screen
case MotionEvent.ACTION_UP:
// paddle stopped
paddle.setMovementState(paddle.STOPPED);
break;
}
return true;
}*/
// Resize Bitmap function to Handle all the Images from resources the right size
public Bitmap getResizedBitmap(Bitmap bm, float newWidth, int newHeight) {
int width = bm.getWidth();
int height = bm.getHeight();
float scaleWidth = newWidth / width;
float scaleHeight = ((float) newHeight) / height;
// CREATE A MATRIX FOR THE MANIPULATION
Matrix matrix = new Matrix();
// RESIZE THE BIT MAP
matrix.postScale(scaleWidth, scaleHeight);
// "RECREATE" THE NEW BITMAP
Bitmap resizedBitmap = Bitmap.createBitmap(
bm, 0, 0, width, height, matrix, false);
bm.recycle();
return resizedBitmap;
}
}
And this is code for Paddle class:
import android.graphics.RectF;
public class Paddle {
// Which ways can the paddle move
public final int STOPPED = 0;
public final int LEFT = 1;
public final int RIGHT = 2;
int scrX;
// RectF is an object that holds four coordinates - just what we need
private RectF rect;
// How long and high our paddle will be
private float length;
private float height;
// X is the far left of the rectangle which forms our paddle
private float x;
// Y is the top coordinate
private float y;
// This will hold the pixels per second speedthat the paddle will move
private float paddleSpeed;
// Is the paddle moving and in which direction
private int paddleMoving = STOPPED;
private int MYscreenDPI;
// This the the constructor method
// When we create an object from this class we will pass
// in the screen width and height
public Paddle(int screenX, int screenY, int screenDPI) {
// Dynamic size based on each device DPI
length = screenDPI / 2;
height = screenDPI / 5;
MYscreenDPI = screenDPI;
scrX = screenX;
// Start paddle in roughly the sceen centre
x = screenX / 2;
y = screenY - screenDPI / 4.50f;
rect = new RectF(x, y, x + length, y + height);
// How fast is the paddle in pixels per second
paddleSpeed = 800;
}
public float getX() {
return x;
}
public void setX(float x) {
this.x = x;
}
public float getY() {
return y;
}
public void setY(float y) {
this.y = y;
}
// This is a getter method to make the rectangle that
// defines our paddle available in BreakoutView class
public RectF getRect() {
return rect;
}
public int getMovementState() {
return paddleMoving;
}
// This method will be used to change/set if the paddle is going left, right or nowhere
public void setMovementState(int state) {
paddleMoving = state;
}
// This update method will be called from update in BreakoutView
// It determines if the paddle needs to move and changes the coordinates
// contained in rect if necessary
public void update(long fps) {
if (paddleMoving == LEFT) {
// to fix Paddle going off the Screen
if (x >= -MYscreenDPI / 10)
// Decrement position
x = x - paddleSpeed / fps;
}
if (paddleMoving == RIGHT) {
// to fix Paddle going off the Screen
if (x <= scrX - length - MYscreenDPI / 14)
// Increment position
x = x + paddleSpeed / fps;
}
// Apply the New position
rect.left = x;
rect.right = x + length;
}
}
When I tried to run it application is always crashing and not working. When I try to use onTouchEvent method to control paddle it is not crashing but accelerometer is not working.
I know that I'm doing something bad. I'm trying to figure it out for like one week but I don't know how to make it working.
If you can tell me any suggestions I will be really thankful. Thank you for all responses.
--EDIT--
Here is error message from logcat when I clicked on new game in emulator:
2019-04-13 17:30:55.116 7082-7082/com.kazaky.breakout E/SensorManager: Exception dispatching input event. 2019-04-13 17:30:55.122 7082-7082/com.kazaky.breakout E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.kazaky.breakout, PID: 7082
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference
at com.kazaky.breakout.GameActivity.onSensorChanged(GameActivity.java:73)
at android.hardware.SystemSensorManager$SensorEventQueue.dispatchSensorEvent(SystemSensorManager.java:833)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:326)
at android.os.Looper.loop(Looper.java:160)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) 2019-04-13 17:31:06.794 7082-7117/com.kazaky.breakout E/Surface: queueBuffer: error queuing buffer to SurfaceTexture, -19 2019-04-13 17:31:06.794 7082-7117/com.kazaky.breakout E/Surface: queueBuffer (handle=0xe9f16140) failed (No such device)
As suggested by the Stack Trace you are trying to access a null object, which in this case I'm guessing sensroEvent in onSensorChanged.
Add a nullability check and return if sensorEvent is null, like so:
if (sensorEvent == null) return
and write the rest of the function after the Guard Condition.
I'm working with camera2 and I'm showing a preview of my photo/video after longclick in my thumbnail. Also, I'm rotating it depending of which orientation the camera had when the picture was taken. For example, if I did a picture in 90º, my preview will be also rotated 90º.
Everything is working fine, I'm using a customContainer and there I'm using onLayout and OnMeasure to create my preview depending of the size of the screen, aspect ratio and orientation. It works fine with photos. My problem appear when I try to do the same with videos, they only work in 0º.
I tried to rotate the TextureView which contain my MediaPlayer but after this my onLayout become crazy and Itś impossible find a (l,t,r,b) combination to measure it correctly.
Here is my XML:
<?xml version="1.0" encoding="utf-8"?>
<com.android.camera.ui.common.ThumbnailContainer xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/preview_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/rounded_rectangle_thumbnail_preview"
android:visibility="invisible">
<TextureView
android:id="#+id/show_video_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:visibility="invisible"/>
<ImageView
android:id="#+id/image_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:adjustViewBounds="true"
android:visibility="invisible"
/>
</com.android.camera.ui.common.ThumbnailContainer>
Here is my Surface code:
#Override
public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
Log.i(TAG, "InicializoSurface. Width: " + width + " HEIGHT:" + height);
Log.i(TAG, "InicializoSurface. Width: " + mVideoView.getMeasuredWidth() + " HEIGHT:" + mVideoView.getMeasuredHeight());
Log.i(TAG, "View transform. Width: " + mVideoView.getWidth() + " HEIGHT:" + mVideoView.getHeight());
mMediaSurface = new Surface(mVideoView.getSurfaceTexture());
initializeMediaPlayer();
}
#Override
public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {
}
#Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
if (mMediaPlayer != null) {
// Make sure we stop video and release resources when activity is destroyed.
mMediaPlayer.stop();
mMediaPlayer.release();
mMediaPlayer = null;
}
return false;
}
#Override
public void onSurfaceTextureUpdated(SurfaceTexture surface) {
}
//////////
private void initializeMediaPlayer(){
mMediaPlayer = new CustomMediaPlayer();
Uri uri = Uri.parse(mCameraDataAdapter.getList().get(0).getPath());
try {
mMediaPlayer.setDataSource(mActivity, uri);
mMediaPlayer.setSurface(mMediaSurface);
mMediaPlayer.prepareAsync();
mMediaPlayer.setOnPreparedListener(mMediaPlayer);
mMediaPlayer.setOnCompletionListener(mMediaPlayer);
} catch (IOException e) {
e.printStackTrace();
}
}
///////////
mVideoView.setVisibility(View.VISIBLE);
// mVideoView.setTranslationX(-200);
// mVideoView.setTranslationY(-200);
Log.i(TAG, "X: " + mVideoView.getX() + "Y: " + mVideoView.getY());
if (mVideoView.isAvailable()) {
onSurfaceTextureAvailable(mVideoView.getSurfaceTexture(), mVideoView.getWidth(), mVideoView.getHeight());
}
if (mMediaPlayer == null) {
initializeMediaPlayer();
}
// mMediaPlayer.mVideoHolder = mVideoView.getHolder();
// mMediaPlayer.setDisplay(mMediaPlayer.mVideoHolder);
if (mMediaPrepared) {
Log.i(TAG,"Comienzo Video");
mMediaPlayer.start();
}
Finally here is my onMeasure/OnLayout from my CustomView
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int width;
int height;
int wantedWidth = 0;
int wantedHeight = 0;
if(mWidth == 0 && mHeight == 0 ){
mWidth = MeasureSpec.getSize(widthMeasureSpec);
mHeight =MeasureSpec.getSize(heightMeasureSpec);
}
width = mWidth;
height = mHeight;
if (mOrientation == 0 || mOrientation == 180) {
wantedWidth = width - (int)(mMargin * 2);
mVideo.measure(MeasureSpec.makeMeasureSpec(wantedWidth, MeasureSpec.EXACTLY), MeasureSpec.makeMeasureSpec((int) (wantedWidth * mVideoAspectRatio), MeasureSpec.EXACTLY));
wantedHeight = (mViewTop.getLayoutParams().height) * 2 + (int) (wantedWidth * mAspectRatio);
} else {
Log.e(TAG, "Real Width = " + width + " real Height = " + height);
wantedHeight = width - 2 * mViewTop.getLayoutParams().height - (int)(mMargin * 2);
mVideo.measure(MeasureSpec.makeMeasureSpec(wantedHeight, MeasureSpec.EXACTLY),MeasureSpec.makeMeasureSpec((int) (wantedHeight * mAspectRatio), MeasureSpec.EXACTLY));
//
wantedWidth =(int) (wantedHeight * mAspectRatio) ;
wantedHeight = width - (int)(mMargin * 2);
}
Log.e(TAG, "onMeasure: " + wantedWidth + "x" + wantedHeight);
setMeasuredDimension(MeasureSpec.makeMeasureSpec(wantedWidth, MeasureSpec.EXACTLY), MeasureSpec.makeMeasureSpec(wantedHeight, MeasureSpec.EXACTLY));
}
#Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
int w = getMeasuredWidth();
int h = getMeasuredHeight();
int viewHeight = mViewBottom.getMeasuredHeight();
int imageViewHeight = mImage.getMeasuredHeight();
int wantedHeight = 0;
// w = w - (int) (2 * mMargin);
if (mOrientation == 0 || mOrientation == 180) {
mVideo.layout(0,wantedHeight,w,wantedHeight + imageViewHeight);
}else{
mVideo.layout(viewHeight,0,r-viewHeight - (int) mMargin,w);
}
}
I have been looking in other post as Android MediaRecorder making rotated video and I saw that it's not possible to rotate the textureView, but I can't believe that I can rotate a image so easily and have to fight during this to rotate 90 degrees a video.
Thanks to #pskink for their comments in the post I found a solution with him. Finally I used a Matrix to rotate the Video Container(Texture View). The method that pskink give me is the next one:
private void setupMatrix(int width, int height, int degrees, boolean isHorizontal) {
Log.d(TAG, "setupMatrix for " + degrees + " degrees");
Matrix matrix = new Matrix();
//The video will be streched if the aspect ratio is in 1,5(recording at 480)
RectF src;
if (isHorizontal)
//In my case, I changed this line, because with my onMeasure() and onLayout() methods my container view is already rotated and scaled, so I need to sent the inverted params to the src.
src = new RectF(0, 0,mThumbnailContainer.getmWidth(), mThumbnailContainer.getmHeight());
else
src = new RectF(0, 0, mThumbnailContainer.getmWidth(),mThumbnailContainer.getmHeight());
RectF dst = new RectF(0, 0, width, height);
RectF screen = new RectF(dst);
Log.d(TAG, "Matrix: " + width + "x" + height);
Log.d(TAG, "Matrix: " + mThumbnailContainer.getmWidth() + "x" + mThumbnailContainer.getmHeight());
matrix.postRotate(degrees, screen.centerX(), screen.centerY());
matrix.mapRect(dst);
matrix.setRectToRect(src, dst, Matrix.ScaleToFit.CENTER);
matrix.mapRect(src);
matrix.setRectToRect(screen, src, Matrix.ScaleToFit.FILL);
matrix.postRotate(degrees, screen.centerX(), screen.centerY());
mVideoView.setTransform(matrix);
}
Finally it worked and it looks totally awesome. With this I have been able to rotate and scale any video totally dynamically depending of the screen of my device and the Aspect Ratio used for record the video or take the picture.
I've been battling with this feature for couple of days now...
It seems, that camera is ignoring(?) focus areas that I've defined. Here is snippets of the code:
Focusing:
protected void focusOnTouch(MotionEvent event) {
if (camera != null) {
Rect rect = calculateFocusArea(event.getX(), event.getY());
Parameters parameters = camera.getParameters();
parameters.setFocusMode(Parameters.FOCUS_MODE_AUTO);
parameters.setFocusAreas(Lists.newArrayList(new Camera.Area(rect, 500)));
camera.setParameters(parameters);
camera.autoFocus(this);
}
}
Focus area calculation:
private Rect calculateFocusArea(float x, float y) {
int left = clamp(Float.valueOf((x / getSurfaceView().getWidth()) * 2000 - 1000).intValue(), focusAreaSize);
int top = clamp(Float.valueOf((y / getSurfaceView().getHeight()) * 2000 - 1000).intValue(), focusAreaSize);
return new Rect(left, top, left + focusAreaSize, top + focusAreaSize);
}
Couple of log events from Camera.AutoFocusCallback#onAutoFocus
Log.d(TAG, String.format("Auto focus success=%s. Focus mode: '%s'. Focused on: %s",
focused,
camera.getParameters().getFocusMode(),
camera.getParameters().getFocusAreas().get(0).rect.toString()));
08-27 11:19:42.240: DEBUG/MyCameraActivity(26268): Auto focus success=true. Focus mode: 'auto'. Focused on: Rect(-109, 643 - -13, 739)
08-27 11:19:55.514: DEBUG/MyCameraActivity(26268): Auto focus success=true. Focus mode: 'auto'. Focused on: Rect(20, 457 - 116, 553)
08-27 11:19:58.037: DEBUG/MyCameraActivity(26268): Auto focus success=true. Focus mode: 'auto'. Focused on: Rect(-159, 536 - -63, 632)
08-27 11:20:00.129: DEBUG/MyCameraActivity(26268): Auto focus success=true. Focus mode: 'auto'. Focused on: Rect(-28, 577 - 68, 673)
Visually it looks like focus succeeds on logged area, but the suddenly it loses focus and focus on center (0, 0), or what takes bigger part of SurfaceView is obtained.
focusAreaSize used in calculation is about 210px (96dp).
Testing on HTC One where Camera.getParameters().getMaxNumFocusAreas() is 1.
Initial focus mode (before first tap) is set to FOCUS_MODE_CONTINUOUS_PICTURE.
Am I doing something wrong here?
Tinkering with Camera.Area rectangle size or weight doesn't show any noticeable effect.
My problem was much simpler :)
All I had to do is cancel previously called autofocus. Basically the correct order of actions is this:
protected void focusOnTouch(MotionEvent event) {
if (camera != null) {
camera.cancelAutoFocus();
Rect focusRect = calculateTapArea(event.getX(), event.getY(), 1f);
Rect meteringRect = calculateTapArea(event.getX(), event.getY(), 1.5f);
Parameters parameters = camera.getParameters();
parameters.setFocusMode(Parameters.FOCUS_MODE_AUTO);
parameters.setFocusAreas(Lists.newArrayList(new Camera.Area(focusRect, 1000)));
if (meteringAreaSupported) {
parameters.setMeteringAreas(Lists.newArrayList(new Camera.Area(meteringRect, 1000)));
}
camera.setParameters(parameters);
camera.autoFocus(this);
}
}
Update
#Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
...
Parameters p = camera.getParameters();
if (p.getMaxNumMeteringAreas() > 0) {
this.meteringAreaSupported = true;
}
...
}
/**
* Convert touch position x:y to {#link Camera.Area} position -1000:-1000 to 1000:1000.
*/
private Rect calculateTapArea(float x, float y, float coefficient) {
int areaSize = Float.valueOf(focusAreaSize * coefficient).intValue();
int left = clamp((int) x - areaSize / 2, 0, getSurfaceView().getWidth() - areaSize);
int top = clamp((int) y - areaSize / 2, 0, getSurfaceView().getHeight() - areaSize);
RectF rectF = new RectF(left, top, left + areaSize, top + areaSize);
matrix.mapRect(rectF);
return new Rect(Math.round(rectF.left), Math.round(rectF.top), Math.round(rectF.right), Math.round(rectF.bottom));
}
private int clamp(int x, int min, int max) {
if (x > max) {
return max;
}
if (x < min) {
return min;
}
return x;
}
Beside setting:
parameters.setFocusMode(Parameters.FOCUS_MODE_AUTO);
you need to set:
parameters.setFocusMode(Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
if you want real 'live' auto-focus. Also, it will be good to check available focuses:
List<String> focusModes = parameters.getSupportedFocusModes();
LLog.d("focusModes=" + focusModes);
if (focusModes.contains(Parameters.FOCUS_MODE_CONTINUOUS_PICTURE))
parameters.setFocusMode(Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
On Samsung S6 you must set this with little delay (~ 500 ms) after getting camera preview.
I had this problem today :/
And after hours of struggling, I found the solution!
It's strange, but it appears that setting focus-mode to "macro" right before setting focus-areas solved the problem ;)
params.setFocusMode(Camera.Parameters.FOCUS_MODE_MACRO);
params.setFocusAreas(focusAreas);
mCamera.setParameters(params);
I have Galaxy S3 with Android 4.1.2
I hope this will work for you either :)
use FOCUS_MODE_FIXED
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
mCamera = Camera.open(mCameraId);
} else {
mCamera = Camera.open();
}
cameraParams = mCamera.getParameters();
// set the focus mode
cameraParams.setFocusMode(Camera.Parameters.FOCUS_MODE_FIXED);
// set Camera parameters
mCamera.setParameters(cameraParams);
Hi, try below code copy and change for yourself
public class CameraActivity extends AppCompatActivity implements Camera.AutoFocusCallback {
private Camera camera;
private FrameLayout fl_camera_preview;
...
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView( R.layout.camera_activity );
//this View, is lens camera
fl_camera_preview = findViewById( R.id.fl_camera_preview );
Button someButtonCapturePicture = findViewById(R.id.someButtonCapturePicture);
pictureCall = getPictureCallback();
//check camera access
if ( getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA) ) {
if ( safeCameraOpen(0) ) {
cameraPreview = new CameraPreview( this, camera );
fl_camera_preview.addView( cameraPreview );
someButtonCapturePicture.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
camera.takePicture(null, null, pictureCall);
}
});
} else {
Log.w(TAG, "getCameraInstance: Camera is not available (in use or does not exist)." );
}
}
}
private boolean safeCameraOpen(int id) {
boolean qOpened = false;
try {
camera = Camera.open( id );
// set some parameters
Camera.Parameters par = camera.getParameters();
List<Camera.Size> supportedPreviewSizes = par.getSupportedPreviewSizes();
for ( Camera.Size cs : supportedPreviewSizes ) {
if ( cs.height == 720 ) {
par.setPictureSize(cs.width, cs.height);
par.setPreviewSize(cs.width, cs.height);
break;
}
}
camera.setParameters(par);
qOpened = ( camera != null );
} catch (Exception e) {
Log.e(TAG, "safeCameraOpen: failed to open Camera");
e.printStackTrace();
}
return qOpened;
}
public void touchFocusCamera( final Rect touchFocusRect ) {
//Convert touche coordinate, in width and height to -/+ 1000 range
final Rect targetFocusRect = new Rect(
touchFocusRect.left * 2000/fl_camera_preview.getWidth() - 1000,
touchFocusRect.top * 2000/fl_camera_preview.getHeight() - 1000,
touchFocusRect.right * 2000/fl_camera_preview.getWidth() - 1000,
touchFocusRect.bottom * 2000/fl_camera_preview.getHeight() - 1000);
final List<Camera.Area> focusList = new ArrayList<Camera.Area>();
Camera.Area focusArea = new Camera.Area(targetFocusRect, 1000);
focusList.add(focusArea);
Camera.Parameters para = camera.getParameters();
List<String> supportedFocusModes = para.getSupportedFocusModes();
if ( supportedFocusModes != null &&
supportedFocusModes.contains(Camera.Parameters.FOCUS_MODE_AUTO) ) {
try {
para.setFocusAreas(focusList);
para.setMeteringAreas(focusList);
camera.setParameters(para);
camera.autoFocus( CameraActivity.this );
} catch (Exception e) {
Log.e(TAG, "handleFocus: " + e.getMessage() );
}
}
}
#Override
public void onAutoFocus(boolean success, Camera camera) {
if ( success ) {
camera.cancelAutoFocus();
}
float focusDistances[] = new float[3];
camera.getParameters().getFocusDistances(focusDistances);
}
/**
* Get Bitmap from camera
* #return picture
*/
private Camera.PictureCallback getPictureCallback() {
Camera.PictureCallback picture = new Camera.PictureCallback() {
#Override
public void onPictureTaken(byte[] data, Camera camera) {
Log.i(TAG, "onPictureTaken: size bytes photo: " + data.length );
}
};
return picture;
}
...
}
//And SurfaceView with Callback
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
private static final String TAG = "CameraPreview";
SurfaceHolder holder;
Camera camera;
public CameraPreview( Context context, Camera _camera ) {
super(context);
camera = _camera;
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
holder = getHolder();
holder.addCallback(this);
// deprecated setting, but required on Android versions prior to 3.0
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
#Override
public void surfaceCreated(SurfaceHolder holder) {
// The Surface has been created, now tell the camera where to draw the preview.
try {
camera.setPreviewDisplay(holder);
camera.startPreview();
} catch (IOException e) {
Log.d(TAG, "Error setting camera preview: " + e.getMessage());
}
}
#Override
public boolean onTouchEvent(MotionEvent event) {
if( event.getAction() == MotionEvent.ACTION_DOWN ) {
// Get the pointer's current position
float x = event.getX();
float y = event.getY();
float touchMajor = event.getTouchMajor();
float touchMinor = event.getTouchMinor();
Rect touchRect = new Rect(
(int)(x - touchMajor/2),
(int)(y - touchMinor/2),
(int)(x + touchMajor/2),
(int)(y + touchMinor/2));
((CameraActivity)getContext())
.touchFocusCamera( touchRect );
}
return true;
}
#Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
// If your preview can change or rotate, take care of those events here.
// Make sure to stop the preview before resizing or reformatting it.
if (this.holder.getSurface() == null) {
// preview surface does not exist
return;
}
// stop preview before making changes
try {
camera.stopPreview();
} catch (Exception e) {
// ignore: tried to stop a non-existent preview
}
// set preview size and make any resize, rotate or
// reformatting changes here
// start preview with new settings
try {
camera.setPreviewDisplay(this.holder);
camera.startPreview();
} catch (Exception e) {
Log.d(TAG, "Error starting camera preview: " + e.getMessage());
}
}
...
}