Question

我有一个适用于大多数手机的相机应用程序，但我今天收到了用户的错误。该错误表明应用程序在Camera.setParameters()上崩溃我已阅读This StackOverflow Post有关该主题的内容，但已实施相同的解决方案。

这是我正在使用的代码：

public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {

        camera.setDisplayOrientation(90);
        Camera.Parameters parameters = camera.getParameters();
        Camera.Size size = getBestPreviewSize(w, h);    
        parameters.setPreviewSize(size.width, size.height); // preview size
        camera.setParameters(parameters);
        camera.startPreview();


        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


    }


private Camera.Size getBestPreviewSize(int width, int height)
    {

        // Get For Photo Size
        Camera.Parameters camparams = camera.getParameters();

        // Find the Best Preview Size
        List<Size> sizes = camparams.getSupportedPreviewSizes();

        Camera.Size result=null;
        int finalHeight = 0;
        for (Size s : sizes) {

            if (s.width <= width && s.height <= height) {
                if (result == null) {
                        result = s;
                        finalHeight = s.height;
                } else {
                        int resultArea=result.width*result.height; 
                        int newArea=s.width*s.height;

                        if (newArea>resultArea) {
                      result=s;
                      finalHeight = s.height;
                     }
                }
            } 
        }

        // Just in case... 
        if (result == null) {
            finalHeight = height;
        }

        result.width = (int)(finalHeight*cameraRatio);


        return result; 

    }

我的想法是在try / catch附近设置camera.setParameter(size.width, size.height)，但我不知道是否会在失败时使其崩溃？

以下是在developer.android.com上发送给我的崩溃日志：

java.lang.RuntimeException：setParameters失败了 android.hardware.Camera.native_setParameters（Native Method）at android.hardware.Camera.setParameters（Camera.java:953）at net.feltpad.mosaic.Preview.surfaceChanged（CameraPreview.java:145）at at android.view.SurfaceView.updateWindow（SurfaceView.java:557）at android.view.SurfaceView.dispatchDraw（SurfaceView.java:348）at android.view.ViewGroup.drawChild（ViewGroup.java:1730）at android.view.ViewGroup.dispatchDraw（ViewGroup.java:1459）at android.view.ViewGroup.drawChild（ViewGroup.java:1730）at android.view.ViewGroup.dispatchDraw（ViewGroup.java:1459）at android.view.ViewGroup.drawChild（ViewGroup.java:1730）at android.view.ViewGroup.dispatchDraw（ViewGroup.java:1459）at android.view.View.draw（View.java:6988）at android.widget.FrameLayout.draw（FrameLayout.java:357）at android.view.ViewGroup.drawChild（ViewGroup.java:1732）at android.view.ViewGroup.dispatchDraw（ViewGroup.java:1459）at android.view.ViewGroup.drawChild（ViewGroup.java:1730）at android.view.ViewGroup.dispatchDraw（ViewGroup.java:1459）at android.view.ViewGroup.drawChild（ViewGroup.java:1730）at android.view.ViewGroup.dispatchDraw（ViewGroup.java:1459）at android.view.ViewGroup.drawChild（ViewGroup.java:1730）at android.view.ViewGroup.dispatchDraw（ViewGroup.java:1459）at android.view.ViewGroup.drawChild（ViewGroup.java:1730）at android.view.ViewGroup.dispatchDraw（ViewGroup.java:1459）at android.view.View.draw（View.java:6988）at android.widget.FrameLayout.draw（FrameLayout.java:357）at android.view.ViewGroup.drawChild（ViewGroup.java:1732）at android.view.ViewGroup.dispatchDraw（ViewGroup.java:1459）at android.view.View.draw（View.java:6988）at android.widget.FrameLayout.draw（FrameLayout.java:357）at com.android.internal.policy.impl.PhoneWindow $ DecorView.draw（PhoneWindow.java:1961）在android.view.ViewRoot.draw（ViewRoot.java:1602）at android.view.ViewRoot.performTraversals（ViewRoot.java:1323）at android.view.ViewRoot.handleMessage（ViewRoot.java:1961）at android.os.Handler.dispatchMessage（Handler.java:99）at android.os.Looper.loop（Looper.java:150）at android.app.ActivityThread.main（ActivityThread.java:4333）at java.lang.reflect.Method.invokeNative（Native Method）at java.lang.reflect.Method.invoke（Method.java:507）at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:839）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:597）at dalvik.system.NativeStart.main（原生方法）

Answer 1

此代码假定您可以将result.width设置为某个动态计算值。这不适用于所有设备。 result 必须是getSupportedPreviewSizes()返回的值之一才能在所有设备上可靠地工作，在您的情况下，它不一定是其中一个值。

Answer 2

您可以拥有CameraHost的扩展类。在此类中，您可以覆盖adjustPreviewParameters函数，这会导致错误的结果大小。以下是我对相机预览的修复：

@Override
public Parameters adjustPreviewParameters(Parameters parameters) {
    List<Camera.Size> sizes = parameters.getSupportedPreviewSizes();
    Camera.Size cs = sizes.get(0);
    parameters.setPreviewSize(cs.width, cs.height);
    return super.adjustPreviewParameters(parameters);
}

Android 2.3.4在Camera.setParameters上崩溃

2 个答案: