如何在Surfaceview android中获得正常的摄像头视图？

Question

现在，我正在做一个示例应用程序，我必须在surfaceview中使用相机。我已经成功地在Surfaceview中设置了相机，但是我无法在其中获得正常的相机视图，宽度和高度也会发生变化。以下是我的代码，我很高兴得到任何人的任何想法。

Camera类：

protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.camera); 
      cameraObject = isCameraAvailiable(); 
    showCamera = new ShowCamera(this, cameraObject); 
    preview.addView(showCamera); 
      takePhotoButton.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) { 
     cameraObject.takePicture(null, null, capturedIt); 
     cameraObject.stopPreview(); 
     preview.removeView(showCamera); 
     cameraObject.release(); 
     cameraObject = Camera.open(); 
     showCamera = new ShowCamera(Photo.this, cameraObject); 

     preview.addView(showCamera); 
     } 
    }); 
} 

SurfaceHolder类：

public class ShowCamera extends SurfaceView implements SurfaceHolder.Callback { 

private SurfaceHolder holdMe; 
private Camera theCamera; 

public ShowCamera(Context context, Camera camera) { 
    super(context); 
    theCamera = camera; 
    holdMe = getHolder(); 
    holdMe.addCallback(this); 
} 

public void surfaceChanged(SurfaceHolder holder, int format, int width, 
     int height) { 
    theCamera.stopPreview(); 
    theCamera.setDisplayOrientation(90); 
    camWidth = width; 
    camHeight = height; 
    theCamera.startPreview(); 
    initPreview(width, height); 
} 

private void initPreview(int width, int height) { 
    // Log.i(TAG, "initPreview()starts"); 

    if (theCamera != null) { 
     try { 
      Camera.Parameters param; 
      param = camera.getParameters(); 
      param.setPreviewSize(176, 144); 
      camera.setParameters(param); 
      theCamera.setPreviewDisplay(holdMe); 
     } catch (Throwable t) { 
      Log.e("PreviewDemo-surfaceCallback", 
        "Exception in setPreviewDisplay()", t); 
     } 
    } 

    // Log.i(TAG, "initPreview() ends"); 
} 

@Override 
public void surfaceCreated(SurfaceHolder holder) { 
    try { 
     theCamera.setDisplayOrientation(90); 
     theCamera.setPreviewDisplay(holdme); 
     theCamera.startPreview(); 
    } catch (IOException e) { 
    } 
} 

public void surfaceDestroyed(SurfaceHolder arg0) { 
    this.getHolder().removeCallback(this); 
    theCamera.stopPreview(); 
    theCamera.release(); 
} 

}

Framelayout.xml

<FrameLayout 
    android:id="@+id/preview1" 
    android:layout_width="match_parent" 
    android:layout_height="200dp" 
    android:layout_alignParentLeft="true"> 

</FrameLayout> 

Answer 1

如果您希望显示相机而不失真，则应该覆盖layout_height为预览帧。如果您知道该相机支持176×144预览大小，这是你真的想用什么，然后简单地设置预览，

showCamera = new ShowCamera(this, cameraObject); 

ViewGroup.LayoutParams lp = preview.getLayoutParams(); 
lp.width = getWindowManager().getDefaultDisplay().getWidth(); 
//*** no, this is wrong!! *** lp.height = lp.width*144/176; 
lp.height = lp.width*176/144; // that's correct for Camera.setDisplayOrientation(90) !! 
preview.setLayoutParams(lp); 

preview.addView(showCamera);