问题
I\'m getting a Fail to connect to camera service exception when I run my Android app in the emulator. I\'ve read the various existing posts but none have fixed this. It is clearly the Camera.open() call which is failing. I would eventually like to get the webcam going in the emulator, as many SO posts discuss, but right now just want the app to run without bombing. I do not care whether any camera video gets shown or not, since there are other features besides the camera that I need to test, and will primarily test the camera on my device anyway.
My manifest seems to be ok. The following lines are in it:
<uses-feature android:name=\"android.hardware.camera\" />
<uses-feature android:name=\"android.hardware.camera.autofocus\" />
<uses-permission android:name=\"android.permission.CAMERA\"></uses-permission>
In my AVD manager I have set both the front and back camera to be \"Emulated\" and the SD Card value to 64. These seem to be the recommended values. The full stack trace is now below. Solution has to be something straightforward, but what?
10-09 08:14:32.375 2628-2628/com.allinlearning.AILAndroidScanner E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.allinlearning.AILAndroidScanner, PID: 2628
java.lang.RuntimeException: Fail to connect to camera service
at android.hardware.Camera.native_setup(Native Method)
at android.hardware.Camera.<init>(Camera.java:350)
at android.hardware.Camera.open(Camera.java:309)
at com.allinlearning.AILAndroidScanner.AsynCamPreview.surfaceCreated(AsynCamPreview.java:104)
at android.view.SurfaceView.updateWindow(SurfaceView.java:572)
at android.view.SurfaceView.access$000(SurfaceView.java:86)
at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:175)
at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:847)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1871)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1000)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5670)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
at android.view.Choreographer.doCallbacks(Choreographer.java:574)
at android.view.Choreographer.doFrame(Choreographer.java:544)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
The code for the entire class is below. Again, it\'s the Camera.open() call that throws the exception:
import java.io.IOException;
import java.util.List;
import android.graphics.Bitmap;
import android.graphics.ImageFormat;
import android.hardware.Camera;
import android.os.AsyncTask;
import android.os.Handler;
import android.os.Looper;
import android.util.Log;
import android.view.SurfaceHolder;
import android.webkit.MimeTypeMap;
import android.widget.ImageView;
public class AsynCamPreview extends MainActivity
implements SurfaceHolder.Callback, Camera.PreviewCallback
{
private Camera mCamera;
public Camera.Parameters params;
private SurfaceHolder sHolder;
private ImageView myCameraPreview = null;
private Bitmap mBitmap = null;
// data arrays
private int[] pixels = null;
private float[] floatpixels = null;
private byte[] FrameData = null;
// Camera params
public float maxZoom;
private int imageFormat;
private int previewSizeWidth;
private int previewSizeHeight;
private int camId = 1;
// flags and counts
private boolean bProcessing = false;
private int frameCount = 0;
private boolean doProcessing = false;
public boolean mProcessInProgress = false;
public static final String TAG = \"AsynCamPreview\";
private long mTiming[] = new long[50];
private int mTimingSlot = 0;
Handler mHandler = new Handler(Looper.getMainLooper());
static {
// System.loadLibrary(\"ImageProcessing\");
Log.i(TAG, \"Native library loaded\");
}
public AsynCamPreview(int previewLayoutWidth, int previewLayoutHeight, ImageView cameraPreview)
{
previewSizeWidth = previewLayoutWidth;
previewSizeHeight = previewLayoutHeight;
myCameraPreview =cameraPreview;
}
@Override
public void onPreviewFrame(byte[] data, Camera camera)
{
// Do nothing for now
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
sHolder = holder;
if (camId == 0) {
mCamera = Camera.open(Camera.CameraInfo.CAMERA_FACING_FRONT);
}
else {
mCamera = Camera.open(Camera.CameraInfo.CAMERA_FACING_BACK);
}
try {
mCamera.setPreviewDisplay(holder);
mCamera.setPreviewCallback(this);
} catch (IOException e) {
mCamera.release();
mCamera= null;
}
params = mCamera.getParameters();
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
params = mCamera.getParameters();
List<Camera.Size> sizes = params.getSupportedPictureSizes();
this.params.setPreviewSize(previewSizeWidth, previewSizeHeight);
mBitmap = Bitmap.createBitmap(previewSizeWidth, previewSizeHeight,
Bitmap.Config.ARGB_8888);
myCameraPreview.setImageBitmap(mBitmap);
pixels = new int[previewSizeWidth * previewSizeHeight];
//floatpixels = new float[previewSizeWidth * previewSizeHeight * 3];
imageFormat = params.getPreviewFormat();
mCamera.setParameters(params);
mCamera.startPreview();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
mCamera.setPreviewCallback(null);
mCamera.stopPreview();
mCamera.release();
mCamera = null;
}
@Override
public void onPause() {
this.mCamera.stopPreview();
}
}
回答1:
From the Android Developers Docs:
Calling Camera.open() throws an exception if the camera is already in use by another application, so we wrap it in a try block.
Try wrapping that code in a try catch block like so:
try {
releaseCameraAndPreview();
if (camId == 0) {
mCamera = Camera.open(Camera.CameraInfo.CAMERA_FACING_FRONT);
}
else {
mCamera = Camera.open(Camera.CameraInfo.CAMERA_FACING_BACK);
}
} catch (Exception e) {
Log.e(getString(R.string.app_name), "failed to open Camera");
e.printStackTrace();
}
Then add this function somewhere:
private void releaseCameraAndPreview() {
myCameraPreview.setCamera(null);
if (mCamera != null) {
mCamera.release();
mCamera = null;
}
}
回答2:
Isn't an permission on android 6.x?
http://developer.android.com/training/permissions/requesting.html
回答3:
With Android 6.0, this error can appened if you don't check for manifest authorisation :
//If authorisation not granted for camera
if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED)
//ask for authorisation
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, 50);
else
//start your camera
this.startCamera();
回答4:
OP mentions this in his question, but my issue was I forgot to enable camera emulation in my AVD emulator settings:
回答5:
Using
if (ContextCompat.checkSelfPermission(getApplicationContext(), android.Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(CodeScanner.this, new String[]{android.Manifest.permission.CAMERA}, 50);
}
worked for me
回答6:
1.Use below permissions in manifest file and always put permissions above Application tag.
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature
android:name="android.hardware.camera"
android:required="false" />
<uses-feature android:name="android.hardware.camera.autofocus" />
2.Use Unlock while camera used by other service like MediaRecorder.
camera.unlock();
recorder.setCamera(camera);
2.Released camera properly, I prefer to use lock so become safely accessible for other application and second time use (In case if we reopen).
if (camera != null) {
camera.lock();
camera.stopPreview();
camera.release();
camera = null;
}
回答7:
If you periodically got a white screen instead your view of camera - use:
private void releaseCameraAndPreview() {
if (mCamera != null) {
mCamera.setPreviewCallback(null);
mCameraView.getHolder().removeCallback(mCameraView);
mCamera.release();
mCamera = null;
}
}
and put it here
try {
releaseCameraAndPreview();
mCamera = getCameraInstance();
}...
and here
@Override
protected void onPause() {
super.onPause();
releaseCameraAndPreview();
}
回答8:
If you are using surface View and using code like this`
Observable.create(CameraUtils.getCameraOnSubscribe())
.subscribeOn(Schedulers.newThread())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(camera -> {
mCamera = camera.open();
...
}};
Then replace mCamera=camera;
来源：https://stackoverflow.com/questions/26305107/how-to-fix-fail-to-connect-to-camera-service-exception-in-android-emulator