Android監聽ScrollView滑動到頂端和底部
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所占的高度.即ScrollView內容的高度.常常有一
* 部分內容要滑動后才可見,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;
@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
;
}
};
}