IOException on Camera.startPreview

pure · by **pure** » Tue Dec 09, 2008 9:43 pm

I am trying to use the PreviewCallback but i get an IOException saying:
"startPreview failed". I run the emulator in the debugger.

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public class CamApp extends Activity implements Camera.PreviewCallback {
        
        @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        SurfaceView surfView = new SurfaceView(this);
        setContentView(surfView);
             
        Camera cam = Camera.open();
        Camera.Parameters parameters = cam.getParameters();
        parameters.setPreviewSize(100, 100);
        cam.setParameters(parameters);  
        cam.setPreviewCallback(this);
        cam.startPreview();
 
    }
 
        @Override
        public void onPreviewFrame(byte[] data, Camera camera) {
                        
        }
  
}
Parsed in 0.033 seconds,  using GeSHi 1.0.8.4

Stack Trace

Code: Select all: Thread [<3> main] (Suspended (exception RuntimeException)) ActivityThread.performLaunchActivity(ActivityThread$ActivityRecord) line: 2140 <--- Here is where i can see the IOException ActivityThread.handleLaunchActivity(ActivityThread$ActivityRecord) line: 2156 ActivityThread.access$1800(ActivityThread, ActivityThread$ActivityRecord) line: 112 ActivityThread$H.handleMessage(Message) line: 1580 ActivityThread$H(Handler).dispatchMessage(Message) line: 88 Looper.loop() line: 123 ActivityThread.main(String[]) line: 3742 Method.invokeNative(Object, Object[], Class, Class[], Class, int, boolean) line: not available [native method] Method.invoke(Object, Object...) line: 515 ZygoteInit$MethodAndArgsCaller.run() line: 739 ZygoteInit.main(String[]) line: 497 NativeStart.main(String[]) line: not available [native method]

pure · by **pure** » Thu Dec 11, 2008 9:44 pm

I have located the the line that throws the exception. What the hell

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static void android_hardware_Camera_startPreview(JNIEnv *env, jobject thiz)
 
{
 
    Camera *c = get_native_camera(env, thiz);
 
    if (c == 0)
 
        return;
 
    if (c->startPreview() != NO_ERROR) {
 
        jniThrowException(env, "java/io/IOException", "startPreview failed");
 
        return;
 
    }
 
}
 
Parsed in 0.031 seconds,  using GeSHi 1.0.8.4

So i guess the c->startPreview() rerurns an error.. but what error and how

There is a lot of logging going on in the cpp files. Is it possible to have the logging turned on in the emulator?

IOException on Camera.startPreview

IOException on Camera.startPreview

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