/**
* ViewFlipper：
* 安卓系统自带的一个多页面管理控件，它可以实现子页面的自动切换
* 为ViewFlipper加入View：
* （1）在layout布局文件静态导入子View
* （2）动态导入：addView（）方法
*
*案例实现：
*（1）利用ViewFlipper实现的图片轮播
*（2）支持手势滑动的ViewFlipper
*
*/ xml文件：
<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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.viewflipperdemo.MainActivity" >
<ViewFlipper
android:id="@+id/flipper"
android:layout_width="match_parent"
android:layout_height="wrap_content"
></ViewFlipper> </RelativeLayout>
动画效果：
left_in.xml:
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" > <translate
android:duration="2000"
android:fromXDelta="-100%p"
android:toXDelta="0" />
<alpha
android:fromAlpha="0.5"
android:toAlpha="1"
android:duration="2000"
/> </set>
left_out:
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" > <translate
android:duration="2000"
android:fromXDelta="0"
android:toXDelta="100%p" /> <alpha
android:duration="2000"
android:fromAlpha="0.5"
android:toAlpha="1" /> </set>
right_in.xml:
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" > <translate
android:duration="2000"
android:fromXDelta="100%p"
android:toXDelta="0" /> <alpha
android:duration="2000"
android:fromAlpha="0.5"
android:toAlpha="1" /> </set>
right_out.xml:
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" > <translate
android:duration="2000"
android:fromXDelta="0"
android:toXDelta="-100%p" /> <alpha
android:duration="2000"
android:fromAlpha="0.5"
android:toAlpha="1" /> </set>
源代码：
package com.example.viewflipperdemo; import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageView;
import android.widget.ViewFlipper; public class MainActivity extends Activity { private ViewFlipper flipper;
private int[] resId = {R.drawable.pic1,R.drawable.pic2,R.drawable.pic3,R.drawable.pic4};
private float startX;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
flipper = (ViewFlipper) findViewById(R.id.flipper); /**
* （1）利用ViewFlipper实现的图片轮播
*/
//动态导入的方式为Flipper加入子view
for (int i = 0; i < resId.length; i++) {
flipper.addView(getImageView(i));
}
//为ViewFlipper去添加动画效果
flipper.setInAnimation(this,R.anim.left_in);
flipper.setOutAnimation(this,R.anim.left_out);
//设定ViewFlipper视图切换的时间 3s
flipper.setFlipInterval(3000);
//开始播放
flipper.startFlipping();
}
//设置触摸事件
@Override
public boolean onTouchEvent(MotionEvent event) {
// TODO Auto-generated method stub
switch(event.getAction()){
//手指落下
case MotionEvent.ACTION_DOWN:{
startX = event.getX(); break;
}
//手指滑动
case MotionEvent.ACTION_MOVE:{
//向右滑动
if(event.getX()-startX>=100){
flipper.setInAnimation(this,R.anim.left_in);;
flipper.setOutAnimation(this, R.anim.left_out);
flipper.showPrevious();
}
//向左滑动
if(startX-event.getX()>=100){
flipper.setInAnimation(this,R.anim.right_in);;
flipper.setOutAnimation(this, R.anim.right_out);
flipper.showNext();
}
break;
}
//手指抬起
case MotionEvent.ACTION_UP:{
break;
}
} return super.onTouchEvent(event);
}
private View getImageView(int res){
ImageView image = new ImageView(this);
image.setBackgroundResource(resId[res]);
return image;
} }