Android監聽ScrollView滑動到頂端和底部

MainActivity如下:

package cn.testscrollview;import android.os.Bundle;import android.view.MotionEvent;import android.view.View;import android.view.View.OnTouchListener;import android.widget.ScrollView;import android.app.Activity;/** * Demo描述: * 監聽ScrollView滑動到頂端和底部 *  * 注意事項: * 1 mScrollView.getChildAt(0).getMeasuredHeight()表示: *   ScrollView所佔的高度.即ScrollView內容的高度.常常有一 *   部分內容要滑動後才可見,這部分的高度也包含在了 *   mScrollView.getChildAt(0).getMeasuredHeight()中 *    * 2 view.getScrollY表示: *   ScrollView頂端已經滑出去的高度 *    * 3 view.getHeight()表示: *   ScrollView的可見高度 *    */public class MainActivity extends Activity {    private ScrollView mScrollView;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);init();}    private void init(){    mScrollView=(ScrollView) findViewById(R.id.scrollView);    mScrollView.setOnTouchListener(new TouchListenerImpl());    }    private class TouchListenerImpl implements OnTouchListener{@Overridepublic boolean onTouch(View view, MotionEvent motionEvent) {switch (motionEvent.getAction()) {case MotionEvent.ACTION_DOWN:break;case MotionEvent.ACTION_MOVE: int scrollY=view.getScrollY(); int height=view.getHeight(); int scrollViewMeasuredHeight=mScrollView.getChildAt(0).getMeasuredHeight(); if(scrollY==0){                System.out.println("滑動到了頂端 view.getScrollY()="+scrollY);                }             if((scrollY+height)==scrollViewMeasuredHeight){                    System.out.println("滑動到了底部 scrollY="+scrollY);                System.out.println("滑動到了底部 height="+height);                System.out.println("滑動到了底部 scrollViewMeasuredHeight="+scrollViewMeasuredHeight);                }break;default:break;}return false;}        };}

 

main.xml如下:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    >    <ScrollView        android:id="@+id/scrollView"        android:layout_width="fill_parent"        android:layout_height="wrap_content" >    <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="@string/hello_world"/>    </ScrollView></RelativeLayout>