Android监听ScrollView滑动到顶端和底部

packagecn.testscrollview;

importandroid.os.Bundle;

importandroid.view.MotionEvent;

importandroid.view.View;

importandroid.view.View.OnTouchListener;

importandroid.widget.ScrollView;

importandroid.app.Activity;

/**

 * Demo描述:

 * 监听ScrollView滑动到顶端和底部

 *

 * 注意事项:

 * 1 mScrollView.getChildAt(0).getMeasuredHeight()表示:

 *   ScrollView所占的高度.即ScrollView内容的高度.常常有一

 *   部分内容要滑动后才可见,这部分的高度也包含在了

 *   mScrollView.getChildAt(0).getMeasuredHeight()中

 *  

 * 2 view.getScrollY表示:

 *   ScrollView顶端已经滑出去的高度

 *  

 * 3 view.getHeight()表示:

 *   ScrollView的可见高度

 *  

 */

publicclass MainActivity extendsActivity {

    privateScrollView mScrollView;

    @Override

    protectedvoid onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        init();

    }

    privatevoid init(){

        mScrollView=(ScrollView) findViewById(R.id.scrollView);

        mScrollView.setOnTouchListener(newTouchListenerImpl());

    }

    privateclass TouchListenerImpl implementsOnTouchListener{

        @Override

        publicboolean onTouch(View view, MotionEvent motionEvent) {

            switch(motionEvent.getAction()) {

            caseMotionEvent.ACTION_DOWN:

 

                break;

            caseMotionEvent.ACTION_MOVE:

                 intscrollY=view.getScrollY();

                 intheight=view.getHeight();

                 intscrollViewMeasuredHeight=mScrollView.getChildAt(0).getMeasuredHeight();

                 if(scrollY==0){

                        System.out.println("滑动到了顶端 view.getScrollY()="+scrollY);

                    }

                 if((scrollY+height)==scrollViewMeasuredHeight){

                        System.out.println("滑动到了底部 scrollY="+scrollY);

                        System.out.println("滑动到了底部 height="+height);

                        System.out.println("滑动到了底部 scrollViewMeasuredHeight="+scrollViewMeasuredHeight);

                    }

                break;

 

            default:

                break;

            }

            returnfalse;

        }

         

    };

}