P.S：我已经添加了所有权限。
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_scan, container, false);
if(checkCameraHardware(getActivity().getApplicationContext())){
getCameraInstance();
mCamera = getCameraInstance();
mPreview = new CameraPreview(this.getActivity(), mCamera);
//container.addView(mPreview);--->Remove this line
//Add this line
FrameLayout preview =(FrameLayout)view.findViewById(R.id.camera_preview);
preview.addView(mPreview);
}
// Inflate the layout for this fragment
return view;
}
public void surfaceCreated(SurfaceHolder holder) {
// The Surface has been created, now tell the camera where to draw the preview.
try {
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
} catch (IOException e) {
Log.d(TAG, "Error setting camera preview: " + e.getMessage());
}
}
//permissions
<uses-permission android:name="android.permission.CAMERA"></uses-permission>
<uses-feature android:name="android.hardware.camera.autofocus" />
//error log
D/tag: C not null
W/CameraBase: An error occurred while connecting to camera: 0
D/tag2: cannot get Camera Instance
W/System.err: java.lang.RuntimeException: Fail to connect to camera service
W/System.err: at android.hardware.Camera.native_setup(Native Method)
W/System.err: at android.hardware.Camera.<init>(Camera.java:469)
W/System.err: at android.hardware.Camera.open(Camera.java:442)
W/System.err: at layout.scan.getCameraInstance(scan.java:113)
W/System.err: at layout.scan.onCreateView(scan.java:84)
W/System.err: at android.app.Fragment.performCreateView(Fragment.java:1700)
W/System.err: at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:890)
W/System.err: at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1062)
W/System.err: at android.app.BackStackRecord.run(BackStackRecord.java:698)
W/System.err: at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1447)
W/System.err: at android.app.FragmentManagerImpl$1.run(FragmentManager.java:443)
W/System.err: at android.os.Handler.handleCallback(Handler.java:808)
W/System.err: at android.os.Handler.dispatchMessage(Handler.java:103)
W/System.err: at android.os.Looper.loop(Looper.java:193)
W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5330)
W/System.err: at java.lang.reflect.Method.invokeNative(Native Method)
W/System.err: at java.lang.reflect.Method.invoke(Method.java:515)
W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:828)
W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:644)
W/System.err: at dalvik.system.NativeStart.main(Native Method)
D/SurfaceView: checkGLSurfaceViewlLogProperty get invalid command
I/SurfaceView: updateWindow -- onWindowVisibilityChanged, visibility = 0
I/Choreographer: Skipped 31 frames! The application may be doing too much work on its main thread.
D/GraphicBuffer: close handle(0x6169bce0) (w:720 h:1280 f:1)
D/GraphicBuffer: close handle(0x623215a8) (w:720 h:1280 f:1)
D/GraphicBuffer: close handle(0x61daa2a8) (w:720 h:1280 f:1)
D/GraphicBuffer: close handle(0x61db12f8) (w:720 h:1280 f:1)
D/GraphicBuffer: create handle(0x61db12f8) (w:720, h:1280, f:1)
I/MaliEGL: [Mali]window_type=1, is_framebuffer=0, errnum = 0
I/MaliEGL: [Mali]surface->num_buffers=4, surface->num_frames=3, win_min_undequeued=1
I/MaliEGL: [Mali]max_allowed_dequeued_buffers=3
D/GraphicBuffer: close handle(0x61db12f8) (w:720 h:1280 f:1)
D/GraphicBuffer: create handle(0x61db12f8) (w:720, h:1280, f:1)
I/SurfaceView: updateWindow -- setFrame
I/SurfaceView: updateWindow -- OnPreDrawListener, mHaveFrame = true
I/SurfaceView: Changes: creating=true format=true size=true visible=true left=true top=true mUpdateWindowNeeded=false mReportDrawNeeded=false redrawNeeded=false forceSizeChanged=true mVisible=false mRequestedVisible=true
I/SurfaceView: Cur surface: Surface(name=null)/@0x42481d80
V/SurfaceView: layout.CameraPreview{42481ad8 V.E..... ......ID 0,0-720,1118} got resized: w=720 h=1118, cur w=-1 h=-1
I/SurfaceView: New surface: Surface(name=null)/@0x42481e50, vis=true, frame=Rect(0, 162 - 720, 1280)
I/SurfaceView: Callback --> surfaceCreated
I/SurfaceView: surfaceCreated callback +
I/SurfaceView: finishedDrawing
D/AndroidRuntime: Shutting down VM
W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x41a2fcf8)
W/dalvikvm: threadid=1: uncaught exception occurred
W/System.err: java.lang.NullPointerException
W/System.err: at layout.CameraPreview.surfaceCreated(CameraPreview.java:37)
W/System.err: at android.view.SurfaceView.updateWindow(SurfaceView.java:662)
W/System.err: at android.view.SurfaceView.access$000(SurfaceView.java:90)
W/System.err: at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:195)
W/System.err: at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:847)
W/System.err: at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2191)
W/System.err: at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1189)
W/System.err: at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6223)
W/System.err: at android.view.Choreographer$CallbackRecord.run(Choreographer.java:788)
W/System.err: at android.view.Choreographer.doCallbacks(Choreographer.java:591)
W/System.err: at android.view.Choreographer.doFrame(Choreographer.java:560)
W/System.err: at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:774)
W/System.err: at android.os.Handler.handleCallback(Handler.java:808)
W/System.err: at android.os.Handler.dispatchMessage(Handler.java:103)
W/System.err: at android.os.Looper.loop(Looper.java:193)
W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5330)
W/System.err: at java.lang.reflect.Method.invokeNative(Native Method)
W/System.err: at java.lang.reflect.Method.invoke(Method.java:515)
W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:828)
W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:644)
W/System.err: at dalvik.system.NativeStart.main(Native Method)
W/dalvikvm: threadid=1: calling UncaughtExceptionHandler
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.root.meeransunday, PID: 3179
java.lang.NullPointerException
at layout.CameraPreview.surfaceCreated(CameraPreview.java:37)
at android.view.SurfaceView.updateWindow(SurfaceView.java:662)
at android.view.SurfaceView.access$000(SurfaceView.java:90)
at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:195)
at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:847)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2191)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1189)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6223)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:788)
at android.view.Choreographer.doCallbacks(Choreographer.java:591)
at android.view.Choreographer.doFrame(Choreographer.java:560)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:774)
at android.os.Handler.handleCallback(Handler.java:808)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5330)
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:828)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:644)
at dalvik.system.NativeStart.main(Native Method)
//One more method Just to add detail
public static Camera getCameraInstance(){
Camera c = null;
try {
c = Camera.open(); // attempt to get a Camera instance
if(c!=null)
{
Log.d("tag"," C not null");
}
}
catch (Exception e)
{
Log.d("tag2","cannot get Camera Instance");
e.printStackTrace();
}
return c; // returns null if camera is unavailable
}
答案 0 :(得分：0)
使用以下方法
android.hardware.Camera.open(int cameraId)
你应该传递cameraId，如果你想要前置摄像头，你可以使用以下方法
private int findFrontFacingCamera() {
// Search for the front facing camera
int numberOfCameras = Camera.getNumberOfCameras();
for (int i = 0; i < numberOfCameras; i++) {
CameraInfo info = new CameraInfo();
Camera.getCameraInfo(i, info);
if (info.facing == CameraInfo.CAMERA_FACING_FRONT) {
cameraId = i;
cameraFront = true;
break;
}
}
return cameraId;
}
如果其他应用程序打开了同一个摄像头，则会抛出RuntimeException。 使用完相机后必须调用release（），否则它将保持锁定状态并且对其他应用程序不可用。 您的应用程序一次只能为一个特定的硬件摄像头激活一个Camera对象。 如果这不起作用，请告诉我。
答案 1 :(得分：0)
在更改相机的朝向之前，请确保停止预览并释放相机。 如果您正在看摄像机，并且立即调用面向摄像机的设置并开始预览，则会抛出诸如“无法连接摄像机服务”之类的错误。
我在这里添加了停止和释放相机的功能。
void stop() {
Log.w(TAG,"stop");
if (mCamera != null) {
mCamera.stopPreview();
}
mShowingPreview = false;
releaseCamera();
}
private void releaseCamera() {
Log.w(TAG,"releaseCamera");
if (mCamera != null) {
mCamera.release();
mCamera = null;
mCallback.onCameraClosed();
}
}
将此功能放到camera1或camera2 api类中。 只需在更改和设置头像之前停止，如下面的代码所示即可。
void setFacing(int facing) {
Log.w(TAG,"setFacing: "+facing);
if (mFacing == facing) {
Log.w(TAG,"Same Facing return");
return;
}
mFacing = facing;
if (isCameraOpened()) {
Log.w(TAG,"Camera is Opened");
stop();
start();
}else{
Log.w(TAG,"Camera is Not Opened");
}
}