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[安卓开发基础] 仿淘宝 轮播图 message handler 使用 

 图片资源[安卓开发基础] 仿淘宝 轮播图 message handler 使用

1.布局:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/taobaobg"
    >
     <ViewFlipper
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:id="@+id/messsage_viewflipper"
         >

     </ViewFlipper>
</LinearLayout>

2. 

package com.viewflipper;

import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
import android.widget.ViewFlipper;
import com.zengjx.androidbaseproject.R;
public class MessageActivity extends AppCompatActivity {
    final    private    int  MSG=1;//消息代码
   private ViewFlipper    viewFlipper;
   private Animation []  animations=new  Animation[2]; //定义动画数组,为ViewFlipper指定切换动画
   private   Message   message;
   private  int[] images=new   int[]{R.drawable.taoboimg1,R.drawable.taoboimg2,
           R.drawable.taoboimg3,R.drawable.taoboimg4,
           R.drawable.taoboimg5,R.drawable.taoboimg6,
           R.drawable.taoboimg7,R.drawable.taoboimg8,
   };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.message);
        viewFlipper=findViewById(R.id.messsage_viewflipper);//获取ViewFlipper
        animations[0]= AnimationUtils.loadAnimation(this,R.anim.slide_in_left);//左进
        animations[1]= AnimationUtils.loadAnimation(this,R.anim.slide_out_right);//右出
        viewFlipper.setInAnimation(animations[0]);//添加进入动画效果
        viewFlipper.setOutAnimation(animations[1]);//添加退出动画效果

        for(int  i=0;i<images.length;i++){//遍历图片资源

            ImageView   imageView =new ImageView(this); //创建ImageView对象
            imageView.setImageResource(images[i]); //将遍历的图片保存在ImageView中
            viewFlipper.addView(imageView);//  //加载图片

        }
        message= Message.obtain(); //获得消息对象
        message.what=MSG;//设置消息代码
        mHandler.sendMessage(message);
    }


 private Handler mHandler = new Handler(new Handler.Callback() {//创建android.os.Handler对象

@Override

public boolean handleMessage(Message msg) {
switch (msg.what){

    case 1:
        viewFlipper.showPrevious();//显示下一张




     break;
}
message=mHandler.obtainMessage(MSG);//获取要发送的消息
mHandler.sendMessageDelayed(message,3000);//延时3秒发送消息
return false;

 }

});
}

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