在Android的摄像头和QUOT; camera.setParameters＆QUOT;失败的 [英] In android the camera "camera.setParameters " failed

问题描述

 在android.hardware.Camera.native_setParameters（本机方法）的
 android.hardware.Camera.setParameters（Camera.java:647）在com.CameraApp preview.surfaceChanged（preview.java：67）。在
 android.view.SurfaceView.updateWindow（SurfaceView.java:538）在
 android.view.SurfaceView.dispatchDraw（SurfaceView.java:339）在
 android.view.ViewGroup.drawChild（ViewGroup.java:1638）在
 android.view.ViewGroup.dispatchDraw（ViewGroup.java:1367）在
 android.view.ViewGroup.drawChild（ViewGroup.java:1638）在
 android.view.ViewGroup.dispatchDraw（ViewGroup.java:1367）在
 android.view.ViewGroup.drawChild（ViewGroup.java:1638）在
 android.view.ViewGroup.dispatchDraw（ViewGroup.java:1367）在
 android.view.View.draw（View.java:6743）在
 android.widget.FrameLayout.draw（FrameLayout.java:352）在
 android.view.ViewGroup.drawChild（ViewGroup.java:1640）在
 android.view.ViewGroup.dispatchDraw（ViewGroup.java:1367）在
 android.view.View.draw（View.java:6743）在
 android.widget.FrameLayout.draw（FrameLayout.java:352）在
 com.android.internal.policy.impl.PhoneWindow $ DecorView.draw（PhoneWindow.java:1842）在
 android.view.ViewRoot.draw（ViewRoot.java:1407）在
 android.view.ViewRoot.performTraversals（ViewRoot.java:1163）在
 android.view.ViewRoot.handleMessage（ViewRoot.java:1727）在
 android.os.Handler.dispatchMessage（Handler.java:99）在
 android.os.Looper.loop（Looper.java:123）在
 android.app.ActivityThread.main（ActivityThread.java:4627）在
 java.lang.reflect.Method.invokeNative（本机方法）的
 java.lang.reflect.Method.invoke（Method.java:521）在
 

我跑了应用上的2.2模拟器也去检查一下。但它工作得很好。谁能告诉我为什么错误是发生???

这code，我用

  SurfaceHolder mHolder;
    公共摄像头摄像头;    preVIEW（上下文的背景下）{
        超级（上下文）;        //安装SurfaceHolder.Callback所以我们得到通知时，
        //创建下垫面和销毁。
        mHolder = getHolder（）;
        mHolder.addCallback（本）;
        mHolder.setType（SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS）;
    }    公共无效surfaceCreated（SurfaceHolder持有人）{
        //表面有被创建，获取摄像机，并告诉它在哪里
        //绘制。
         相机= Camera.open（）;
        尝试{
            camera.set previewDisplay（支架）;
        }赶上（IOException异常除外）{
            camera.release（）;
            摄像头= NULL;
            // TODO：在此处增加更多的异常处理逻辑
        }
    }    公共无效surfaceDestroyed（SurfaceHolder持有人）{
        //当我们回到地面就会被破坏，因此停止preVIEW。
        //因为CameraDevice对象不是共享资源，这是非常
        //重要的是释放它当活动被暂停。
        camera.stop preVIEW（）;
        camera.release（）;
        摄像头= NULL;
    }    公共无效surfaceChanged（SurfaceHolder架，INT格式，诠释W，INT高）{
        //现在，尺寸是已知的，设置相机参数，并开始
        //将preVIEW。        Camera.Parameters参数= camera.getParameters（）;
        parameters.set previewSize（W，H）;
        camera.setParameters（参数）;
        camera.start preVIEW（）;
    }@覆盖
公共无效画（油画画布）{
        super.draw（画布）;
        涂料P =新的油漆（Color.RED）;
        Log.d（TAG，画）;
        canvas.drawText（preVIEW，canvas.getWidth（）/ 2，canvas.getHeight（）/ 2，p）的;
}
 

解决方案

在您的code改变这一点。

 公共无效surfaceChanged（SurfaceHolder架，INT格式，诠释W，INT高）{
    Camera.Parameters参数= camera.getParameters（）;
    清单＆LT; Camera.Size＆GT; previewSizes = parameters.getSupported previewSizes（）;    //你需要选择你的应用程序最合适的previewSize
    Camera.Size previewSize = // ....这里previewSizes选择的一个    parameters.set previewSize（previewSize.width，previewSize.height）;
    camera.setParameters（参数）;
    camera.start preVIEW（）;
}
 

感谢..

如果任何查询剩余然后告诉我

 at android.hardware.Camera.native_setParameters(Native Method) at                  
 android.hardware.Camera.setParameters(Camera.java:647) at com.CameraApp.Preview.surfaceChanged(Preview.java:67) at      
 android.view.SurfaceView.updateWindow(SurfaceView.java:538) at 
 android.view.SurfaceView.dispatchDraw(SurfaceView.java:339) at 
 android.view.ViewGroup.drawChild(ViewGroup.java:1638) at 
 android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367) at 
 android.view.ViewGroup.drawChild(ViewGroup.java:1638) at  
 android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367) at 
 android.view.ViewGroup.drawChild(ViewGroup.java:1638) at 
 android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367) at  
 android.view.View.draw(View.java:6743) at 
 android.widget.FrameLayout.draw(FrameLayout.java:352) at 
 android.view.ViewGroup.drawChild(ViewGroup.java:1640) at 
 android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367) at 
 android.view.View.draw(View.java:6743) at 
 android.widget.FrameLayout.draw(FrameLayout.java:352) at 
 com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1842) at 
 android.view.ViewRoot.draw(ViewRoot.java:1407) at 
 android.view.ViewRoot.performTraversals(ViewRoot.java:1163) at 
 android.view.ViewRoot.handleMessage(ViewRoot.java:1727) at 
 android.os.Handler.dispatchMessage(Handler.java:99) at 
 android.os.Looper.loop(Looper.java:123) at 
 android.app.ActivityThread.main(ActivityThread.java:4627) at 
 java.lang.reflect.Method.invokeNative(Native Method) at 
 java.lang.reflect.Method.invoke(Method.java:521) at 

I ran the app on 2.2 emulator also to check it. But it worked fine. can anyone please tell me why the error is occuring???

This code i used

    SurfaceHolder mHolder;
    public Camera camera;

    Preview(Context context) {
        super(context);

        // Install a SurfaceHolder.Callback so we get notified when the
        // underlying surface is created and destroyed.
        mHolder = getHolder();
        mHolder.addCallback(this);
        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }



    public void surfaceCreated(SurfaceHolder holder) {
        // The Surface has been created, acquire the camera and tell it where
        // to draw.
         camera = Camera.open();
        try {
            camera.setPreviewDisplay(holder);
        } catch (IOException exception) {
            camera.release();
            camera = null;
            // TODO: add more exception handling logic here
        }
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
        // Surface will be destroyed when we return, so stop the preview.
        // Because the CameraDevice object is not a shared resource, it's very
        // important to release it when the activity is paused.
        camera.stopPreview();
        camera.release();
        camera = null;
    }

    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
        // Now that the size is known, set up the camera parameters and begin
        // the preview.

        Camera.Parameters parameters = camera.getParameters();
        parameters.setPreviewSize(w, h);
        camera.setParameters(parameters);
        camera.startPreview();
    }

@Override
public void draw(Canvas canvas) {
        super.draw(canvas);
        Paint p= new Paint(Color.RED);
        Log.d(TAG,"draw");
        canvas.drawText("PREVIEW", canvas.getWidth()/2, canvas.getHeight()/2, p );
}

解决方案

Change this in your code.

public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
    Camera.Parameters parameters = camera.getParameters();
    List<Camera.Size> previewSizes = parameters.getSupportedPreviewSizes();

    // You need to choose the most appropriate previewSize for your app
    Camera.Size previewSize = // .... select one of previewSizes here

    parameters.setPreviewSize(previewSize.width, previewSize.height);
    camera.setParameters(parameters);
    camera.startPreview();
}

thanks..

If any Query remaining Then Tell me

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