Camera Preview api demo


  1. android88

    android88 Member

    Hello everyone. I'm completely new to android, so hopefully someone can help me with this :)

    I'm trying to run the Camera Preview api demo from the android website emulator (set to android 1.5), but i keep getting error the "application has stopped unexpectedly" error. Logcat says the following:

    01-05 21:13:24.550: WARN/ServiceManager(542): Permission failure: android.permission.CAMERA from uid=10035 pid=867
    01-05 21:13:24.561: ERROR/CameraService(542): Permission Denial: can't use the camera pid=867, uid=10035
    01-05 21:13:24.580: DEBUG/AndroidRuntime(867): Shutting down VM
    01-05 21:13:24.590: WARN/dalvikvm(867): threadid=3: thread exiting with uncaught exception (group=0x4001aa28)
    01-05 21:13:24.590: ERROR/AndroidRuntime(867): Uncaught handler: thread main exiting due to uncaught exception
    01-05 21:13:24.610: ERROR/AndroidRuntime(867): java.lang.RuntimeException: Fail to connect to camera service

    From what i read online, the permission error should be fixed by adding a line to the manifest, but that doesn't seem to work. I tried adding two different lines:
    Code (Text):
    1. <uses-permission android:name="android.permission.CAMERA" />
    and
    Code (Text):
    1. <uses-permission android:name="android.permission.CAMERA"></uses-permission>
    But for both i still get the error. Does anyone see my problem?

    Below is the main code. I didn't change anything in the layout file, and i only added the permission line to the manifold.

    Code (Text):
    1.  
    2.  
    3.  
    4. package nl.example.camerapreview;
    5.  
    6. import android.app.Activity;
    7. import android.content.Context;
    8. import android.hardware.Camera;
    9. import android.os.Bundle;
    10. import android.view.SurfaceHolder;
    11. import android.view.SurfaceView;
    12. import android.view.Window;
    13. import java.io.IOException;
    14.  
    15. // ----------------------------------------------------------------------
    16.  
    17. public class CameraPreview extends Activity {    
    18.     private Preview mPreview;
    19.  
    20.     @Override
    21.         protected void onCreate(Bundle savedInstanceState) {
    22.         super.onCreate(savedInstanceState);
    23.         System.out.println("hoera");
    24.         // Hide the window title.
    25.         requestWindowFeature(Window.FEATURE_NO_TITLE);
    26.  
    27.         // Create our Preview view and set it as the content of our activity.
    28.         try{
    29.             mPreview = new Preview(this);
    30.             setContentView(mPreview);
    31.             System.out.println("hoera");
    32.             }
    33.         catch(RuntimeException e){
    34.             System.out.println(e.getMessage());
    35.         }
    36.     }
    37.  
    38. }
    39.  
    40. // ----------------------------------------------------------------------
    41.  
    42. class Preview extends SurfaceView implements SurfaceHolder.Callback {
    43.     SurfaceHolder mHolder;
    44.     Camera mCamera;
    45.  
    46.     Preview(Context context) {
    47.         super(context);
    48.  
    49.         // Install a SurfaceHolder.Callback so we get notified when the
    50.         // underlying surface is created and destroyed.
    51.         mHolder = getHolder();
    52.         mHolder.addCallback(this);
    53.         mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    54.     }
    55.  
    56.     public void surfaceCreated(SurfaceHolder holder) {
    57.         // The Surface has been created, acquire the camera and tell it where
    58.         // to draw.
    59.         mCamera = Camera.open();
    60.         try {
    61.            mCamera.setPreviewDisplay(holder);
    62.         } catch (IOException exception) {
    63.             mCamera.release();
    64.             mCamera = null;
    65.             // TODO: add more exception handling logic here
    66.         }
    67.     }
    68.  
    69.     public void surfaceDestroyed(SurfaceHolder holder) {
    70.         // Surface will be destroyed when we return, so stop the preview.
    71.         // Because the CameraDevice object is not a shared resource, it's very
    72.         // important to release it when the activity is paused.
    73.         mCamera.stopPreview();
    74.         mCamera.release();
    75.         mCamera = null;
    76.     }
    77.  
    78.     public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
    79.         // Now that the size is known, set up the camera parameters and begin
    80.         // the preview.
    81.         Camera.Parameters parameters = mCamera.getParameters();
    82.         parameters.setPreviewSize(w, h);
    83.         mCamera.setParameters(parameters);
    84.         mCamera.startPreview();
    85.     }
    86.  
    87. }

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  2. eclipsed4utoo

    eclipsed4utoo Well-Known Member

    can you post your manifest file?
  3. android88

    android88 Member

    I just found the problem. It was in the manifest file :)
    According to a tutorial the permission line needed to be within the <application> </application>, but it needed to be outside it.
    Now it works :)
    thanks for the reply
  4. draffodx

    draffodx Member

    Yep it needs to be outside the application tags, that one stung me when I was starting too :)

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