Why capturing images of bright lights such as LED screens become pink?

Why capturing images of bright lights such as LED screens become pink? - android

In my camera app, whenever i am capturing images of bright lights such as LED screens. The white images become pink. WHY ?
i am getting bright images like this one
Here is what i have used to capture images:
btnCapture.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (safeToTakePicture) {
camera.takePicture(null, null, mPicture);
safeToTakePicture = false;
}
}
});
#Override
public void onResume() {
super.onResume();
camera=Camera.open();
}
#Override
public void onPause() {
super.onPause();
if (inPreview) {
camera.stopPreview();
}
camera.release();
camera=null;
inPreview=false;
}
private Camera.Size getBestPreviewSize(int width, int height,
Camera.Parameters parameters) {
Camera.Size result=null;
for (Camera.Size size : parameters.getSupportedPreviewSizes()) {
if (size.width <= width && size.height <= height) {
if (result == null) {
result=size;
}
else {
int resultArea=result.width * result.height;
int newArea=size.width * size.height;
if (newArea > resultArea) {
result=size;
}
}
}
}
return(result);
}
private Camera.Size getSmallestPictureSize(Camera.Parameters parameters) {
Camera.Size result=null;
for (Camera.Size size : parameters.getSupportedPictureSizes()) {
if (result == null) {
result=size;
}
else {
int resultArea=result.width * result.height;
int newArea=size.width * size.height;
if (newArea < resultArea) {
result=size;
}
}
}
return(result);
}
SurfaceHolder.Callback surfaceCallback=new SurfaceHolder.Callback(){
public void surfaceCreated(SurfaceHolder holder) {
try {
camera.setPreviewDisplay(previewHolder);
} catch (Throwable t) {
Log.e("PreviewDemo-surfaceCallback",
"Exception in setPreviewDisplay()", t);
Toast.makeText(CameraLauncherActivity.this, t.getMessage(), Toast.LENGTH_LONG).show();
}
}
public void surfaceChanged(SurfaceHolder holder,int format, int width,int height) {
params = camera.getParameters();
Camera.Size size = getBestPreviewSize(width, height, params);
Camera.Size pictureSize=getSmallestPictureSize(params);
if (size != null && pictureSize != null) {
params.setPreviewSize(size.width, size.height);
params.setPictureSize(pictureSize.width,
pictureSize.height);
camera.setParameters(params);
camera.startPreview();
safeToTakePicture = true;
inPreview=true;
}
public void surfaceDestroyed(SurfaceHolder holder) {
}
};
}
I did not find any solution, and here i am looking for the best way to get bright screen images in white itself not in pink.

Related

Why does scheduleWithFixedDelay only run once?

My program is suppose to store a byte[] image from the camera in an ArrayList every 250 ms.
I am testing the same code on 2 separate devices:
the first is a Nexus 7 running Android 4.4.2 and the second is a Nexus 10 running Android 4.4.3.
The Nexus 7 runs the scheduleWithFixedDelay function perfectly, but the Nexus 10 does not. The Nexus 10 runs it once and then stops.
class RunnableCamera implements Runnable {
ScheduledExecutorService serviceCam = Executors.newSingleThreadScheduledExecutor();
#Override
public void run() {
startCamera CAM = new startCamera();
serviceCam.scheduleWithFixedDelay(new Runnable()
{
#Override
public void run()
{
camera.takePicture(null, null, mPicture);
}
}, 0, 250, TimeUnit.MILLISECONDS);
}
private PictureCallback mPicture = new PictureCallback() {
#Override
public void onPictureTaken(byte[] data, Camera camera) {
camera.startPreview();
imagesArrayList.add(data);
Log.d("image", "byte[] added to ArrayList");
}
};
public class startCamera implements Callback {
//private Camera camera;
private SurfaceHolder holder = null;
public startCamera() {
videoView = (VideoView) findViewById(R.id.vwCamera);
holder = videoView.getHolder();
holder.addCallback(this);
Log.d("bro", "startCamera() constructor");
}
#Override
public void surfaceCreated(SurfaceHolder holder) {
try {
Log.i("bro", "surfaceCreated");
camera = Camera.open(0);
camera.setDisplayOrientation(90);
if (camera != null) {
camera.setPreviewDisplay(holder);
} else {
Log.i("bro", "camera = null");
}
} catch (Exception e) {
Log.v(TAG, "Could not start the preview-Display123");
e.printStackTrace();
}
}
#Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
Log.i("bro", "surfaceChanged");
//Sets correct preview resolution
if (holder.getSurface() == null){
Log.i("bro", "holder.getSurface() == null");
return;
}
Camera.Parameters parameters = camera.getParameters();
Log.i("bro", "camera.getParameters();");
sizes = parameters.getSupportedPreviewSizes();
Log.i("bro", "parameters.getSupportedPreviewSizes();");
Camera.Size optimalSize = getBestPreviewSize(width, height);
try {
parameters.setPreviewSize(optimalSize.width, optimalSize.height);
camera.setParameters(parameters);
} catch (NullPointerException a) {
}
Log.i("bro", "startPreview()");
camera.startPreview();
}
#Override
public void surfaceDestroyed(SurfaceHolder holder) {
Log.i("bro", "surfaceDestroyed");
if (camera != null) {
camera.stopPreview();
camera.release();
Log.i("bro", "CAMERA STOPPED");
}
}
private Camera.Size getBestPreviewSize(int width, int height) {
Camera.Size result = null;
Camera.Parameters p = camera.getParameters();
for (Camera.Size size : p.getSupportedPreviewSizes()) {
if (size.width <= width && size.height <= height) {
if (result == null) {
result = size;
} else {
int resultArea = result.width * result.height;
int newArea = size.width * size.height;
if (newArea > resultArea) {
result = size;
}
}
}
}
return result;
}
}
}
In my onCreate method I start the Runnable class like:
Thread thread1 = new Thread(new RunnableCamera());
thread1.start();
If I change the time delay to 600 ms, the Nexus 10 runs it perfectly. I'm wondering if this is a device issue with the first generation Nexus 10, an Android 4.4.3 issue or something wrong with my code. Is there a better way to do this?

android camera start activity after picture taken

I am creating small app which previews camera and when clicking on screen saves image.
My problem is when image is saved, I want to start different activity which will do preview and have some tools on it. But what ever I do activity doesn't start.
Here is my code
public class CameraActivity extends Activity {
private SurfaceView preview = null;
private SurfaceHolder previewHolder = null;
private Camera camera = null;
private boolean inPreview = false;
private boolean cameraConfigured = false;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.camera);
preview = (SurfaceView) findViewById(R.id.preview);
Button button = (Button) findViewById(R.id.button_capture);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (camera != null) {
camera.takePicture(null, null, photoCallback);
onPause();
Intent intent = new Intent(CameraActivity.this, PreviewAndSaveActivity.class);
intent.putExtra("image", "");
CameraActivity.this.startActivity(intent);
}
}
});
previewHolder = preview.getHolder();
previewHolder.addCallback(surfaceCallback);
previewHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
#Override
public void onResume() {
super.onResume();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
Camera.CameraInfo info = new Camera.CameraInfo();
for (int i = 0; i < Camera.getNumberOfCameras(); i++) {
Camera.getCameraInfo(i, info);
if (info.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {
camera = Camera.open(i);
}
}
}
if (camera == null) {
camera = Camera.open();
}
startPreview();
}
#Override
public void onPause() {
if (camera != null) {
if (inPreview) {
camera.stopPreview();
}
camera.release();
camera = null;
}
inPreview = false;
super.onPause();
}
private Camera.Size getBestPreviewSize(int width, int height,
Camera.Parameters parameters) {
Camera.Size result = null;
for (Camera.Size size : parameters.getSupportedPreviewSizes()) {
if (size.width <= width && size.height <= height) {
if (result == null) {
result = size;
} else {
int resultArea = result.width * result.height;
int newArea = size.width * size.height;
if (newArea > resultArea) {
result = size;
}
}
}
}
return (result);
}
private Camera.Size getSmallestPictureSize(Camera.Parameters parameters) {
Camera.Size result = null;
for (Camera.Size size : parameters.getSupportedPictureSizes()) {
if (result == null) {
result = size;
} else {
int resultArea = result.width * result.height;
int newArea = size.width * size.height;
if (newArea < resultArea) {
result = size;
}
}
}
return (result);
}
private void initPreview(int width, int height) {
if (camera != null && previewHolder.getSurface() != null) {
try {
camera.setPreviewDisplay(previewHolder);
} catch (Throwable t) {
Log.e("PreviewDemo-surfaceCallback",
"Exception in setPreviewDisplay()", t);
Toast.makeText(CameraActivity.this, t.getMessage(),
Toast.LENGTH_LONG).show();
}
if (!cameraConfigured) {
Camera.Parameters parameters = camera.getParameters();
Camera.Size size = getBestPreviewSize(width, height, parameters);
Camera.Size pictureSize = getSmallestPictureSize(parameters);
if (size != null && pictureSize != null) {
parameters.setPreviewSize(size.width, size.height);
parameters.setPictureSize(pictureSize.width,
pictureSize.height);
parameters.setPictureFormat(ImageFormat.JPEG);
parameters.setFlashMode(Camera.Parameters.FLASH_MODE_AUTO);
camera.setParameters(parameters);
cameraConfigured = true;
}
}
}
}
private void startPreview() {
if (cameraConfigured && camera != null) {
camera.startPreview();
inPreview = true;
}
}
SurfaceHolder.Callback surfaceCallback = new SurfaceHolder.Callback() {
public void surfaceCreated(SurfaceHolder holder) {
// no-op -- wait until surfaceChanged()
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
initPreview(width, height);
startPreview();
}
public void surfaceDestroyed(SurfaceHolder holder) {
}
};
Camera.PictureCallback photoCallback = new Camera.PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
camera.takePicture(null, null, new PhotoHandler(
getApplicationContext()));
camera.startPreview();
inPreview = true;
}
};
}
And in PhotoHandler after decoding and saving image I want to start activity
public class PhotoHandler implements PictureCallback {
private final Context context;
public PhotoHandler(Context context) {
this.context = context;
}
#Override
public void onPictureTaken(byte[] data, Camera camera) {
File pictureFileDir = getDir();
if (!pictureFileDir.exists() && !pictureFileDir.mkdirs()) {
Log.d("", "Can't create directory to save image.");
Toast.makeText(context, "Can't create directory to save image.",
Toast.LENGTH_LONG).show();
return;
}
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyymmddhhmmss");
String date = dateFormat.format(new Date());
String photoFile = "pic_" + date + ".jpg";
String pictureName = pictureFileDir.getPath() + File.separator
+ photoFile;
File pictureFile = new File(pictureName);
FileOutputStream fos = null;
try {
fos = new FileOutputStream(pictureFile);
fos.write(data);
Intent intent = new Intent(context, PreviewAndSaveActivity.class);
intent.putExtra("image", pictureName);
context.startActivity(intent);
} catch (Exception error) {
Toast.makeText(context, "Image could not be saved.",
Toast.LENGTH_LONG).show();
} finally {
if (fos != null) {
try {
fos.flush();
fos.close();
} catch (IOException e) {
}
}
}
}
private File getDir() {
File sdDir = Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
return new File(sdDir, "dir");
}
}
Any suggestion what am I doing wrong?

try this code :
(Replace your button click listener )
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (camera != null) {
camera.takePicture(null, null, photoCallback);
onPause();
Intent intent = new Intent(CameraActivity.this, PreviewAndSaveActivity.class);
intent.putExtra("image", "");
CameraActivity.this.startActivityForResult(intent, 100);
}
}
});
In your CameraActivity add this callback method to redirect on another activity after image save :
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 100) {
// start you new activity from here...
}
super.onActivityResult(requestCode, resultCode, data);
}

onConfigurationChanged never gets called

In the Manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.app"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="10"
android:targetSdkVersion="17" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature
android:name="android.hardware.camera.front"
android:required="false" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.app.MainActivity"
android:configChanges="keyboardHidden|orientation|screenSize"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
In the MainActivity:
#Override
public void onConfigurationChanged(Configuration newConfig) {
// TODO Auto-generated method stub
super.onConfigurationChanged(newConfig);
Toast.makeText(MainActivity.this,
"newConfig.orientation = " + newConfig.orientation,
Toast.LENGTH_LONG).show();
//The above Toast never appears
}
Complete MainActivty Code:
public class MainActivity extends Activity {
private SurfaceView preview = null;
private SurfaceHolder previewHolder = null;
private Camera camera = null;
private boolean inPreview = false;
private boolean cameraConfigured = false;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
preview = (SurfaceView) findViewById(R.id.preview);
previewHolder = preview.getHolder();
previewHolder.addCallback(surfaceCallback);
previewHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
#Override
public void onResume() {
super.onResume();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
Camera.CameraInfo info = new Camera.CameraInfo();
for (int i = 0; i < Camera.getNumberOfCameras(); i++) {
Camera.getCameraInfo(i, info);
if (info.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {
camera = Camera.open(i);
}
}
}
if (camera == null) {
camera = Camera.open();
}
// camera.setDisplayOrientation(90);
startPreview();
}
#Override
public void onPause() {
if (inPreview) {
camera.stopPreview();
}
camera.release();
camera = null;
inPreview = false;
super.onPause();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
new MenuInflater(this).inflate(R.menu.activity_main, menu);
return (super.onCreateOptionsMenu(menu));
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == R.id.camera) {
if (inPreview) {
camera.takePicture(null, null, photoCallback);
inPreview = false;
}
}
return (super.onOptionsItemSelected(item));
}
private Camera.Size getBestPreviewSize(int width, int height,
Camera.Parameters parameters) {
Camera.Size result = null;
for (Camera.Size size : parameters.getSupportedPreviewSizes()) {
if (size.width <= width && size.height <= height) {
if (result == null) {
result = size;
} else {
int resultArea = result.width * result.height;
int newArea = size.width * size.height;
if (newArea > resultArea) {
result = size;
}
}
}
}
return (result);
}
private Camera.Size getSmallestPictureSize(Camera.Parameters parameters) {
Camera.Size result = null;
for (Camera.Size size : parameters.getSupportedPictureSizes()) {
if (result == null) {
result = size;
} else {
int resultArea = result.width * result.height;
int newArea = size.width * size.height;
if (newArea < resultArea) {
result = size;
}
}
}
return (result);
}
private void initPreview(int width, int height) {
if (camera != null && previewHolder.getSurface() != null) {
try {
camera.setPreviewDisplay(previewHolder);
} catch (Throwable t) {
}
if (!cameraConfigured) {
Camera.Parameters parameters = camera.getParameters();
Camera.Size size = getBestPreviewSize(width, height, parameters);
Camera.Size pictureSize = getSmallestPictureSize(parameters);
if (size != null && pictureSize != null) {
parameters.setPreviewSize(size.width, size.height);
parameters.setPictureSize(pictureSize.width,
pictureSize.height);
parameters.setPictureFormat(ImageFormat.JPEG);
camera.setParameters(parameters);
cameraConfigured = true;
}
}
}
}
private void startPreview() {
if (cameraConfigured && camera != null) {
camera.startPreview();
inPreview = true;
}
}
SurfaceHolder.Callback surfaceCallback = new SurfaceHolder.Callback() {
public void surfaceCreated(SurfaceHolder holder) {
// no-op -- wait until surfaceChanged()
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
initPreview(width, height);
startPreview();
}
public void surfaceDestroyed(SurfaceHolder holder) {
// no-op
}
};
Camera.PictureCallback photoCallback = new Camera.PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
new SavePhotoTask().execute(data);
camera.startPreview();
inPreview = true;
}
};
class SavePhotoTask extends AsyncTask<byte[], String, String> {
#Override
protected String doInBackground(byte[]... jpeg) {
File photo = new File(Environment.getExternalStorageDirectory(),
"photo.jpg");
if (photo.exists()) {
photo.delete();
}
try {
FileOutputStream fos = new FileOutputStream(photo.getPath());
fos.write(jpeg[0]);
fos.close();
} catch (java.io.IOException e) {
}
return (null);
}
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
// TODO Auto-generated method stub
super.onConfigurationChanged(newConfig);
Toast.makeText(MainActivity.this,
"newConfig.orientation = " + newConfig.orientation,
Toast.LENGTH_LONG).show();
}
}

Its because AutoRotation is disabled on your device :D :D

java.lang.RuntimeException: Method call after release()

i have an android application which has two camera activities. they switch time to time in between them. after switching several times first activity throws this exception.. any idea why this happen?
how to fix it? Please help me.thank you for reading my question and have a nice day!
public abstract class SampleViewBase extends SurfaceView implements SurfaceHolder.Callback, Runnable {
private static final String TAG = "LogcatActivity";
private Camera mCamera;
private SurfaceHolder mHolder;
private int mFrameWidth;
private int mFrameHeight;
private byte[] mFrame;
private boolean mThreadRun;
private int frameNumber=1;//my
public SampleViewBase(Context context) {///
super(context);
mHolder = getHolder();
mHolder.addCallback(this);
Log.i(TAG, "Instantiated new " + this.getClass());
}
public int getFrameWidth() {
return mFrameWidth;
}
public int getFrameHeight() {
return mFrameHeight;
}
public void surfaceChanged(SurfaceHolder _holder, int format, int width, int height) {
Log.i(TAG, "surfaceCreated");
if (mCamera != null) {
Camera.Parameters params = mCamera.getParameters();
List<Camera.Size> sizes = params.getSupportedPreviewSizes();
//--
List<String> flashing_methords=params.getSupportedFlashModes();
params.setFlashMode(flashing_methords.get(3));
// List<String> color_effects=params.getSupportedColorEffects();
// params.setColorEffect(color_effects.get(2));
//--
mFrameWidth = width;
mFrameHeight = height;
// selecting optimal camera preview size
{
double minDiff = Double.MAX_VALUE;
for (Camera.Size size : sizes) {
if (Math.abs(size.height - height) < minDiff) {
mFrameWidth = size.width;
mFrameHeight = size.height;
minDiff = Math.abs(size.height - height);
}
}
}
params.setPreviewSize(getFrameWidth(), getFrameHeight());
mCamera.setParameters(params);
mCamera.startPreview();
}
}
public void surfaceCreated(SurfaceHolder holder) {
Log.i(TAG, "surfaceCreated");
try{
mCamera.reconnect();
mCamera = Camera.open();
mCamera.setPreviewCallback(new PreviewCallback() {
public void onPreviewFrame(byte[] data, Camera camera) {
synchronized (SampleViewBase.this) {
mFrame = data;
SampleViewBase.this.notify();
}
/* if((frameNumber%120)==0){
synchronized (SampleViewBase.this) {
mFrame = data;
SampleViewBase.this.notify();
frameNumber=1;
}
}else{
frameNumber++;
}*/
}
});
(new Thread(this)).start();
}catch (Exception e) {
Log.v(TAG, "reconnect error" + e);
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
Log.i(TAG, "surfaceDestroyed");
mThreadRun = false;
if (mCamera != null) {
synchronized (this) {
mCamera.stopPreview();
mCamera.setPreviewCallback(null);
mCamera.release();
mCamera = null;
}
}
}
protected abstract Bitmap processFrame(byte[] data);
public void run() {
mThreadRun = true;
Log.i(TAG, "Starting processing thread");
while (mThreadRun) {
Bitmap bmp = null;
synchronized (this) {
try {
this.wait();
bmp = processFrame(mFrame);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
if (bmp != null) {
Canvas canvas = mHolder.lockCanvas();
if (canvas != null) {
canvas.drawBitmap(bmp, (canvas.getWidth() - getFrameWidth()) / 2, (canvas.getHeight() - getFrameHeight()) / 2, null);
mHolder.unlockCanvasAndPost(canvas);
}
bmp.recycle();
}
}
}
public void releaseAll() {
Log.i(TAG, "hardweare released");
mThreadRun = false;
if (mCamera != null) {
synchronized (this) {
mCamera.stopPreview();
mCamera.setPreviewCallback(null);
mCamera.release();
mCamera = null;
}
}
}
}

Try to release your camera resources from your activity after you override the back key.
#Override
public void onBackPressed()
{
releaseCamera();
super.onBackPressed();
}
private void releaseCamera()
{
synchronized (this)
{
if(mCamera!=null)
{
mCamera.stopPreview();
mCamera.setPreviewCallback(null);
mCamera.release();
mCamera = null;
}
}
}
add the method releaseCamera() to your SurfaceView and make the call from your activity when user clicks back button.

the mCamera.release() function means to disconnect and release the Camera object resources. which performs a job identical to your next mCamera = null; statement. Why would you do that?

Android Camera Preview Switch between cameras

I am trying to switch between the device's Front and Back Camera while showing the camera preview. I am following the sample provide by common ware. Below is the code which I am using. Whenever I click on the Flip button, the surface view goes black, and I don't know where I am going wrong. I have tried to restart the current activity, but I don't want like that.
package com.commonsware.android.camera;
import android.app.Activity;
import android.hardware.Camera;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.Toast;
import android.widget.ToggleButton;
public class PreviewDemo extends Activity {
private SurfaceView preview = null;
private SurfaceHolder previewHolder = null;
private Camera camera = null;
private boolean inPreview = false;
private boolean cameraConfigured = false;
private ToggleButton flipCamera;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
flipCamera = (ToggleButton) findViewById(R.id.flip);
preview = (SurfaceView) findViewById(R.id.preview);
previewHolder = preview.getHolder();
previewHolder.addCallback(surfaceCallback);
previewHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
flipCamera.setOnCheckedChangeListener(new OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
// TODO Auto-generated method stub
restartPreview(isChecked);
}
});
}
#Override
public void onResume() {
super.onResume();
// camera=Camera.open();
int camId = Camera.CameraInfo.CAMERA_FACING_BACK;
if (Camera.getNumberOfCameras() > 1
&& camId < Camera.getNumberOfCameras() - 1) {
// startCamera(camId + 1);
camera = Camera.open(camId + 1);
} else {
// startCamera(Camera.CameraInfo.CAMERA_FACING_BACK);
camera = Camera.open(camId);
}
startPreview();
}
void restartPreview(boolean isFront) {
if (inPreview) {
camera.stopPreview();
}
//
camera.release();
// camera=null;
// inPreview=false;
// /*int camId = Camera.CameraInfo.CAMERA_FACING_BACK;
// if (Camera.getNumberOfCameras() > 1 && camId <
// Camera.getNumberOfCameras() - 1) {
// //startCamera(camId + 1);
// camera = Camera.open(camId + 1);
// } else {
// //startCamera(Camera.CameraInfo.CAMERA_FACING_BACK);
// camera = Camera.open(camId);
// }*/
int camId = Camera.CameraInfo.CAMERA_FACING_BACK;
if (isFront) {
camera = Camera.open(camId);
camera.startPreview();
} else {
camera = Camera.open(camId + 1);
camera.startPreview();
}
// startPreview();
}
#Override
public void onPause() {
if (inPreview) {
camera.stopPreview();
}
camera.release();
camera = null;
inPreview = false;
super.onPause();
}
private Camera.Size getBestPreviewSize(int width, int height,
Camera.Parameters parameters) {
Camera.Size result = null;
for (Camera.Size size : parameters.getSupportedPreviewSizes()) {
if (size.width <= width && size.height <= height) {
if (result == null) {
result = size;
} else {
int resultArea = result.width * result.height;
int newArea = size.width * size.height;
if (newArea > resultArea) {
result = size;
}
}
}
}
return (result);
}
private void initPreview(int width, int height) {
if (camera != null && previewHolder.getSurface() != null) {
try {
camera.setPreviewDisplay(previewHolder);
} catch (Throwable t) {
Log.e("PreviewDemo-surfaceCallback",
"Exception in setPreviewDisplay()", t);
Toast.makeText(PreviewDemo.this, t.getMessage(),
Toast.LENGTH_LONG).show();
}
if (!cameraConfigured) {
Camera.Parameters parameters = camera.getParameters();
Camera.Size size = getBestPreviewSize(width, height, parameters);
if (size != null) {
parameters.setPreviewSize(size.width, size.height);
camera.setParameters(parameters);
cameraConfigured = true;
}
}
}
}
private void startPreview() {
if (cameraConfigured && camera != null) {
camera.startPreview();
inPreview = true;
}
}
SurfaceHolder.Callback surfaceCallback = new SurfaceHolder.Callback() {
public void surfaceCreated(SurfaceHolder holder) {
// no-op -- wait until surfaceChanged()
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
initPreview(width, height);
startPreview();
}
public void surfaceDestroyed(SurfaceHolder holder) {
// no-op
if (camera != null) {
/*
* Call stopPreview() to stop updating the preview surface.
*/
camera.stopPreview();
/*
* Important: Call release() to release the camera for use by
* other applications. Applications should release the camera
* immediately in onPause() (and re-open() it in onResume()).
*/
camera.release();
camera = null;
}
}
};
}

You seem to have forgotten to call setPreviewDisplay() (or, in your case, initPreview()) before calling startPreview() from your restartPreviev() method. Effectively, you're trying to start preview without specifying a surface to render the preview into.

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