Android Viewpager如何實(shí)現(xiàn)輪播廣告圖

<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"
  tools:context="${relativePackage}.${activityClass}" >

 <android.support.v4.view.ViewPager
   android:id="@+id/viewpager_main"
   android:layout_width="match_parent"
   android:layout_height="180dp"
   ></android.support.v4.view.ViewPager>
<LinearLayout 
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:orientation="vertical"
  android:layout_alignBottom="@id/viewpager_main"
  android:background="#44000000"
  >
  <TextView 
    android:id="@+id/text_main_tatle"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="3dp"
    android:gravity="center_horizontal"
    android:text="廣告標(biāo)題"
    android:textColor="#fff"
    />
  <LinearLayout
    android:id="@+id/ll_main_point_group" 
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:layout_gravity="center_horizontal"
    ></LinearLayout>
  
  
</LinearLayout>
</RelativeLayout>

package com.example.viewpager_text2;

import java.util.ArrayList;
import android.R.integer;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
  ViewPager viewPager;
  TextView text_main_tatle;
  LinearLayout ll_main_point_group;
  ArrayList <ImageView>imageviews;
  //圖片資源
  int [] imageids={
    R.drawable.a,
    R.drawable.b,
    R.drawable.c,
    R.drawable.d,
    R.drawable.e,
  };
  //圖片的標(biāo)題集合
  String [] imagetion={
    "有型有范","周末放假","家電買一送一","預(yù)約迎新機(jī)","京東火鍋節(jié)" 
  };
  int preposition=0;//設(shè)置高亮的位置
  Handler handler=new Handler(){
    public void handleMessage(android.os.Message msg) {
      int item=viewPager.getCurrentItem()+1;
      viewPager.setCurrentItem(item);
      //延遲發(fā)消息
      handler.sendEmptyMessageDelayed(0,3000);
    };
  };
  boolean isdragging=false;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //加載布局初始化
    viewPager=(ViewPager) findViewById(R.id.viewpager_main);
    text_main_tatle=(TextView) findViewById(R.id.text_main_tatle);
    ll_main_point_group=(LinearLayout) findViewById(R.id.ll_main_point_group);
    
//   listview 的使用
//   1,在布局中文件定義viewpager
//   2,在代碼中實(shí)例化Viewpager
//   3,準(zhǔn)備數(shù)據(jù)
    imageviews=new ArrayList<ImageView>();
    for(int i=0;i<imageids.length;i++){
      ImageView imageview=new ImageView(this);
      imageview.setBackgroundResource(imageids[i]);
      //添加到集合中
      imageviews.add(imageview);
      //添加小圓點(diǎn)
      ImageView imageview1=new ImageView(this);
      imageview1.setBackgroundResource(R.drawable.xuna);
      LinearLayout.LayoutParams par=new LinearLayout.LayoutParams(8,8);
      if(i==0){
        imageview1.setEnabled(true);//顯示紅色
        
      }else{
        imageview1.setEnabled(false);//顯示灰色
        par.leftMargin=8;
      }
      ll_main_point_group.addView(imageview1);
    }
    
    
    
//   4,設(shè)置適配器(pageradapter)-Item布局-綁定數(shù)據(jù)
    viewPager.setAdapter(new Mypager());
    viewPager.setOnPageChangeListener(new myon());
    //設(shè)置中間位置,要保證是imageview的整數(shù)倍數(shù)
    int item=Integer.MAX_VALUE/2-
        Integer.MAX_VALUE/2 % imageviews.size();
    viewPager.setCurrentItem(item);
    text_main_tatle.setText(imagetion[preposition]);
    //延遲發(fā)消息
    handler.sendEmptyMessageDelayed(0,3000);
    
    
    
  }
  class myon implements OnPageChangeListener {
//當(dāng)前頁面滾動變化的時候會回調(diào)此方法
//   靜止-->滑動 或 滑動-->靜止 或 靜止-->拖拽
    @Override
    public void onPageScrollStateChanged(int arg0) {
      // TODO Auto-generated method stub
      if(arg0==ViewPager.SCROLL_STATE_DRAGGING){//拖拽
        isdragging=true;
        
      }else if(arg0==ViewPager.SCROLL_STATE_SETTLING){//滾動
        
      }else if(arg0==ViewPager.SCROLL_STATE_IDLE&& isdragging){//靜止
        isdragging=false;
        handler.removeCallbacksAndMessages(null);
        handler.sendEmptyMessageDelayed(0, 3000);
        
      }
    }

    
//   當(dāng)前頁面滾動的時候回調(diào)此方法
//   arg0 當(dāng)期頁面的位置
//   arg1滑動頁面的百分比
//   arg2 在屏幕上滑動的像素
    @Override
    public void onPageScrolled(int arg0, float arg1, int arg2) {
      // TODO Auto-generated method stub
      
    }
//當(dāng)某個界面被選中時的回調(diào)方法
//   arg0本選中頁面的位置
    @Override
    public void onPageSelected(int arg0) {
      // TODO Auto-generated method stub
      int realpostion=arg0%imageviews.size();
      //設(shè)置對應(yīng)頁面的文本信息
      text_main_tatle.setText(imagetion[realpostion]);
      //壩上一個高亮的設(shè)置成灰色
      ll_main_point_group.getChildAt(preposition)
      .setEnabled(false);
      //當(dāng)前設(shè)置成紅色
    ll_main_point_group.getChildAt(realpostion)
    .setEnabled(true);
    preposition=realpostion;
    }
    
  }
  class Mypager extends PagerAdapter{
//得到圖片的總數(shù)
    
    @Override
    public int getCount() {
      // TODO Auto-generated method stub
//     return imageviews.size();
      return Integer.MAX_VALUE;//int類型的最大值
    }
    //相當(dāng)于getView的方法
    //container Viewpager自身
    //position 當(dāng)前實(shí)例化頁面的位置(下標(biāo))
    @Override
    public Object instantiateItem(ViewGroup container, int position) {
      int realPostion=position% imageviews.size();
      // TODO Auto-generated method stub
      ImageView imageview = imageviews.get(realPostion);
      container.addView(imageview);//添加到Viewpager中
      imageview.setOnTouchListener(new OnTouchListener() {
          
        @Override
        public boolean onTouch(View v, MotionEvent event) {
          // TODO Auto-generated method stub
          switch (event.getAction()) {
          case MotionEvent.ACTION_DOWN://手指按下時的操作
            handler.removeCallbacksAndMessages(null);
            break;
          case MotionEvent.ACTION_MOVE://手指移動時的操作
            break;
          case MotionEvent.ACTION_CANCEL://事件取消
            handler.removeCallbacksAndMessages(null);
            handler.sendEmptyMessageDelayed(0, 3000);
            break;
          case MotionEvent.ACTION_UP://手指抬起時的操作
            handler.removeCallbacksAndMessages(null);
            handler.sendEmptyMessageDelayed(0, 3000);
            break;
          }
          return false;
        }
      });
      imageview.setTag(realPostion);
      imageview.setOnClickListener(new OnClickListener() {
        
        @SuppressLint("ShowToast")
        @Override
        public void onClick(View v) {
          // TODO Auto-generated method stub
          int position = (Integer) v.getTag();
          String text=imagetion[position];
          Toast.makeText(MainActivity.this, text, 0).show();
        }
      });
      return imageview;
    }
    
  
//比較View和Object是否是同一個實(shí)例
    //arg0 就是頁面
    //arg1是instantiateItem返回的結(jié)果
    @Override 
    public boolean isViewFromObject(View arg0, Object arg1) {
      // TODO Auto-generated method stub
      return arg0==arg1;
      
    }
    //釋放資源
//   container就是Viewpager
//   position 要釋放的位置
//   object要釋放的頁面
    @Override 
    public void destroyItem(ViewGroup container, int position, Object object) {
      container.removeView((View) object);
    }
  }
}