Question

我正在制作教育用途，一款Android APP。这个APP，调用服务（服务在任务完成时死亡）并拍摄没有UI的照片，没有声音。

这个APP在我的旧HTC Desire（root）中运行良好，但不能在Nexus4中启动。我做错了什么？为什么在certanly手机上工作但在其他手机上没有？

代码：

public class OIM_CameraControl extends Service
{       

private final IBinder mBinder = new OIM_CameraControlBinder();  
private Camera mCamera;
private Parameters parameters;
private TelephonyManager telephonyManager;

@Override
public int onStartCommand(Intent intent, int flags, int startId) {

    try {

        SurfaceView sv = new SurfaceView(getApplicationContext());


        if(mCamera == null) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {


                Camera.CameraInfo info=new Camera.CameraInfo();

                    for (int i=0; i < Camera.getNumberOfCameras(); i++) {                   
                    Camera.getCameraInfo(i, info);

                    if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {

                        mCamera=Camera.open(i);
                    }
                }
            }
        }

        if (mCamera == null) {
            System.out.println("No se ha detectado ninguna camara");
            mCamera=Camera.open();
        }


        mCamera.setPreviewDisplay(sv.getHolder());

        // I tried change parameters, add new parameters, delete parameters
        // a lot of combinations,... never works in Nexus4.
        parameters = mCamera.getParameters();
        parameters.setPreviewSize(720, 480);
        parameters.setPictureSize(720, 480);
        parameters.setFocusMode(Parameters.FOCUS_MODE_FIXED);
        parameters.setFlashMode(Parameters.FLASH_MODE_OFF);
        parameters.setZoom(0);
        parameters.set("orientation", "portrait");
        parameters.set("rotation",90);
        mCamera.setParameters(parameters);

        mCamera.startPreview();
        mCamera.takePicture(null, null, mCall);

    } 
    catch (Exception e) {
        System.out.println(e.getMessage());
    }

    return START_NOT_STICKY;

}

private Camera.PictureCallback mCall = new Camera.PictureCallback() 
{
    public void onPictureTaken(byte[] data, Camera camera) 
    {
//Do something
    }
};

//CLASES INTERNAS DE BINDER
public class OIM_CameraControlBinder extends Binder {
    public OIM_CameraControl getService() {
        return  OIM_CameraControl.this;
    }
}

@Override
public IBinder onBind(Intent intent) {
    return mBinder;
}

在我的清单中：

<uses-permission android:name="android.permission.CAMERA" />

<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-feature android:name="android.hardware.camera.flash" />

logcat的：

06-17 11:25:29.620: D/Camera(14346): app passed NULL surface
06-17 11:25:29.650: W/System.err(14346): java.lang.RuntimeException: takePicture failed
06-17 11:25:29.660: W/System.err(14346):    at android.hardware.Camera.native_takePicture(Native Method)
06-17 11:25:29.660: W/System.err(14346):    at android.hardware.Camera.takePicture(Camera.java:1095)
06-17 11:25:29.660: W/System.err(14346):    at android.hardware.Camera.takePicture(Camera.java:1040)
06-17 11:25:29.660: W/System.err(14346):    at com.obviousdevelop.estigia.objects.implement.OIM_CameraControl.onStartCommand(OIM_CameraControl.java:57)
06-17 11:25:29.660: W/System.err(14346):    at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2656)
06-17 11:25:29.660: W/System.err(14346):    at android.app.ActivityThread.access$1900(ActivityThread.java:141)
06-17 11:25:29.660: W/System.err(14346):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1331)
06-17 11:25:29.660: W/System.err(14346):    at android.os.Handler.dispatchMessage(Handler.java:99)
06-17 11:25:29.660: W/System.err(14346):    at android.os.Looper.loop(Looper.java:137)
06-17 11:25:29.660: W/System.err(14346):    at android.app.ActivityThread.main(ActivityThread.java:5041)
06-17 11:25:29.660: W/System.err(14346):    at java.lang.reflect.Method.invokeNative(Native Method)
06-17 11:25:29.660: W/System.err(14346):    at java.lang.reflect.Method.invoke(Method.java:511)
06-17 11:25:29.660: W/System.err(14346):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
06-17 11:25:29.660: W/System.err(14346):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
06-17 11:25:29.660: W/System.err(14346):    at dalvik.system.NativeStart.main(Native Method)

提前致谢！

Answer 1

检查，拍照后是否再次致电Camera.startPreview()。

请点击链接并检查您的代码并与之匹配..

http://developer.android.com/reference/android/hardware/Camera.html

没有UI，相机无法正常工作

1 个答案: