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:
* 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
*
*/
public class MainActivity extends Activity {
private ScrollView mScrollView;
@Override
protected 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{
@Override
public 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;
}
return false;
}
};
}
<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>
