如何在Android GridView中实现平移和缩放缩放手势？

Question

我想使用Android GridView制作一块电路板如下 -

我需要使用两个手指使GridView可缩放并且还可以进行pannable。 什么是标准且简单的方法？

我可以使用以下代码使图像视图可缩放但不能平移 -

public class MainActivity extends Activity {

    private ImageView imageView;
    private float scale = 1f;
    private ScaleGestureDetector detector;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        imageView=(ImageView)findViewById(R.id.imageView);
        detector = new ScaleGestureDetector(this,new ScaleListener());
    }

    public boolean onTouchEvent(MotionEvent event) {
//  re-route the Touch Events to the ScaleListener class
        detector.onTouchEvent(event);
        return super.onTouchEvent(event);
    }

    private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {


        float onScaleBegin = 0;
        float onScaleEnd = 0;

        @Override
        public boolean onScale(ScaleGestureDetector detector) {
            scale *= detector.getScaleFactor();
            imageView.setScaleX(scale);
            imageView.setScaleY(scale);
            return true;
        }

        @Override
        public boolean onScaleBegin(ScaleGestureDetector detector) {

            Toast.makeText(getApplicationContext(),"Scale Begin" ,Toast.LENGTH_SHORT).show();
            onScaleBegin = scale;

            return true;
        }

        @Override
        public void onScaleEnd(ScaleGestureDetector detector) {

            Toast.makeText(getApplicationContext(),"Scale Ended",Toast.LENGTH_SHORT).show();
            onScaleEnd = scale;

            if (onScaleEnd > onScaleBegin){
                Toast.makeText(getApplicationContext(),"Scaled Up by a factor of  " + String.valueOf( onScaleEnd / onScaleBegin ), Toast.LENGTH_SHORT  ).show();
            }

            if (onScaleEnd < onScaleBegin){
                Toast.makeText(getApplicationContext(),"Scaled Down by a factor of  " + String.valueOf( onScaleBegin / onScaleEnd ), Toast.LENGTH_SHORT  ).show();
            }

            super.onScaleEnd(detector);
        }
    }
}

我尝试在此代码中使用gridview替换imageview部分。但那没用。我该如何正确实现？