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我还在市场上推出了该应用程序。我从其中一位用户那里收到一条错误消息，说他在打开相机时遇到了错误。

我也有同样的问题

所以我尝试替换此代码：

public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
        // If your preview can change or rotate, take care of those events here.
        // Make sure to stop the preview before resizing or reformatting it.



         Log.d(TAG, "surfaceChanged to " + "," + w + "," +  h);

        if (mHolder.getSurface() == null){
          // preview surface does not exist
          return;
        }

        // stop preview before making changes
        try {
            mCamera.stopPreview();
        } catch (Exception e){
          // ignore: tried to stop a non-existent preview
        }

        // set preview size and make any resize, rotate or
        // reformatting changes here

        // start preview with new settings
        try {
            mCamera.setPreviewDisplay(mHolder);
            mCamera.startPreview();

        } catch (Exception e){
            Log.d(TAG, "Error starting camera preview: " + e.getMessage());
        }
    }

到这个代码：

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

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

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

我收到 NullPointerException 错误

即使我也不关心显示变化，因为它只是横向

android:screenOrientation="landscape"
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1 回答 1

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在链接的文章中，异常是RuntimeException由尝试设置不受支持的预览大小引起的。但在你的情况下，它是一个NullException. 可能您的 mCamera 对象未初始化。

于 2013-06-02T16:04:37.313 回答