小编A.J*_*uni的帖子

我想在imageView应用程序启动后5秒内更改图像.

这是我到目前为止尝试的代码:

public class MainActivity extends Activity {
ImageView screen;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    screen=(ImageView)findViewById(R.id.imageView1);

    screen.setImageResource(R.drawable.ic_launcher);

    }
}

看起来如何:http: //i41.tinypic.com/30278m1.png

它看起来像在pic中,我希望它具有正确的长宽比和正确的旋转

请看一下代码,我该如何解决？

这是我的代码:

    public class MainActivity extends Activity implements SurfaceHolder.Callback {

Camera mCamera;
SurfaceView mPreview; 

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mPreview = (SurfaceView)findViewById(R.id.preview);
    mPreview.getHolder().addCallback(this);
    mPreview.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    mCamera = Camera.open();
}   
@Override
public void onPause() {
    super.onPause();
    mCamera.stopPreview();
}    
@Override
public void onDestroy() {
    super.onDestroy();
    mCamera.release();
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
    Camera.Parameters params = mCamera.getParameters();
    List<Camera.Size> sizes = params.getSupportedPreviewSizes();
    Camera.Size selected = sizes.get(0);
    params.setPreviewSize(selected.width,selected.height);
    mCamera.setParameters(params);
    mCamera.startPreview();
} …