Android相机预览:1:1宽高比,怎么样？

Question

嗨,我正在尝试使用相机在我的应用程序中捕获图像.特别之处在于我需要一个方形预览区域(最后是图片).我尝试将图片和预览的大小定义为1:1的像素比例,但没有任何接缝可以工作.无论我做什么,这张照片都在广场上被"压扁"了.

谁知道如何解决这个问题？

码:

public class AddFromCameraActivity extends Activity implements SurfaceHolder.Callback {
private Camera mCamera;
private Parameters mParameters; 
private SurfaceView mCameraPreview;
private SurfaceHolder mSurfaceHolder; 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.addimagefromcameramain); 
    initialise(); 
    //Testing area
    mCamera = Camera.open(); 
    mParameters = mCamera.getParameters(); 
    mParameters.setFlashMode(Camera.Parameters.FLASH_MODE_AUTO); 
    mParameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO); 
    mParameters.setJpegQuality(50); 
    mParameters.setJpegThumbnailQuality(50); 
    mParameters.setPictureSize(1024, 1024);
    //mParameters.setPreviewFormat(ImageFormat.JPEG); 
    mParameters.setJpegThumbnailSize(256, 256); 
    mParameters.setPreviewSize(500, 500); 
    mCamera.setParameters(mParameters);
}
private void initialise()
{
    mCameraPreview = (SurfaceView)findViewById(R.id.cameraSurfaceView); 
    mSurfaceHolder = mCameraPreview.getHolder(); 
    mSurfaceHolder.addCallback(this); 
    mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); 
    mSurfaceHolder.setFixedSize(500, 500); 
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
        int height) {

}
@Override
public void surfaceCreated(SurfaceHolder holder) {
    try {
        mCamera.setPreviewDisplay(mSurfaceHolder);
        mCamera.startPreview(); 
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } 
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
    mCamera.stopPreview(); 
    mCamera.release(); 
}
@Override
public void onPause()
{
    mCamera.release(); 
}
}

谢谢

Answer 1

您可以查看Android SDK 中的CameraPreview 示例代码。该getOptimalPreviewSize方法展示了如何处理不同的相机尺寸，该onLayout方法展示了如何在活动中布局预览表面。