RuntimeException：未能连接到摄像机服务

Question

我在StackOverflow上搜索了很多关于此错误的信息，但一直未能找到解决方案。

这是个例外：

java.lang.RuntimeException: Fail to connect to camera service 
      at android.hardware.Camera.native_setup(Native Method) 
      at android.hardware.Camera.<init>(Camera.java:351) 
      at android.hardware.Camera.open(Camera.java:325) 
      at com.app.app.Scatta.surfaceCreated(Scatta.java:232) 
      at android.view.SurfaceView.updateWindow(SurfaceView.java:572) 
      at android.view.SurfaceView.access$000(SurfaceView.java:86) 
      at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:175) 
      at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:847) 
      at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1867) 
      at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:996) 
      at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5600) 
      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:5001) 
      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:785) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) 
      at dalvik.system.NativeStart.main(Native Method) 

时Camera.open被称为内void surfaceCreated

的应用程序崩溃，这是我的代码：

public class Scatta extends Activity implements SurfaceHolder.Callback { 

    android.hardware.Camera camera; 
    SurfaceView surfaceView; 
    SurfaceHolder surfaceHolder; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    setContentView(R.layout.scatta_layout); 

    surfaceView = (SurfaceView) findViewById(R.id.camerapreview); 
    surfaceHolder = surfaceView.getHolder(); 
    surfaceHolder.addCallback(this); 
    surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); 

    controlInflater = LayoutInflater.from(getBaseContext()); 
    viewControl = controlInflater.inflate(R.layout.camera_layout, null); 

    ViewGroup.LayoutParams layoutParams = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT); 
    this.addContentView(viewControl, layoutParams); 

    RelativeLayout relativeLayout = (RelativeLayout) viewControl.findViewById(R.id.relative_camera); 
    relativeLayout.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      camera.autoFocus(autoFocusCallback); 
     } 
    }); 

...

@Override 
public void surfaceCreated(SurfaceHolder holder) { 
    if (camera == null){ 

     camera = android.hardware.Camera.open(); ////////this is the row 232 

     try{ 

      camera.setPreviewDisplay(holder); 

     }catch (IOException e) { 
      e.printStackTrace(); 

      camera.release(); 
      camera = null; 
     } 
    } 
} 


@Override 
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { 

    if (previewing) { 

     camera.stopPreview(); 

    } 
    else { 

     android.hardware.Camera.Parameters parameters = camera.getParameters(); 
     Display display = ((WindowManager)getSystemService(WINDOW_SERVICE)).getDefaultDisplay(); 

     if (display.getRotation() == Surface.ROTATION_90){ 
      parameters.setPreviewSize(width, height); 
     } 
     if (display.getRotation() == Surface.ROTATION_0) { 
      parameters.setPreviewSize(height, width); 
      camera.setDisplayOrientation(90); 
     } 
     if (display.getRotation() == Surface.ROTATION_180) { 
      parameters.setPreviewSize(height, width); 
     } 
     if (display.getRotation() == Surface.ROTATION_270) { 
      parameters.setPreviewSize(width, height); 
      camera.setDisplayOrientation(180); 
     } 

     parameters.setFocusMode(android.hardware.Camera.Parameters.FOCUS_MODE_AUTO); 

     List<android.hardware.Camera.Size> sizes = parameters.getSupportedPictureSizes(); 

     size = sizes.get(0); 

     parameters.setPictureSize(size.width, size.height); 

     camera.setParameters(parameters); 

     Thread preview_thread = new Thread(new Runnable() { 
      @Override 
      public void run() { 

       camera.startPreview(); 
      } 
     }, "preview_thread"); 
     preview_thread.start(); 

     previewing = true; 
    } 
} 

@Override 
public void surfaceDestroyed(SurfaceHolder holder) { 

    if (camera != null){ 
     camera.stopPreview(); 
     camera.release(); 
     camera = null; 
    } 
} 

，这是AndroidManifest.xml

<uses-permission android:name="android.permission.CAMERA"/> 
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> 
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> 
<uses-permission android:name="android.permission.INTERNET" /> 
<uses-permission android:name="android.permission.FLASHLIGHT"/> 
<uses-feature android:name="android.hardware.camera" /> 
<uses-feature android:name="android.hardware.camera.autofocus" /> 

<application 
... 

奇怪的是，在三星Galaxy酷睿我看不出这个问题，但是在荣誉6存在以及在模拟器（Genymotion）

设备的工作原理是怎么样的，但在另一个设备上，而不是在同一个Android版本上？

Answer 1

写在你的gradle.build targetSdkVersion 22.这是一个临时的解决方案，但工作。