Android ViewPager實(shí)現(xiàn)輪播圖效果

public class MyViewPagerAdapter extends PagerAdapter {

private List<ImageView> mList;

public MyViewPagerAdapter(List<ImageView> mList){

 this.mList=mList;

}
//當(dāng)要顯示的圖片進(jìn)行緩存時(shí)，會(huì)調(diào)用這個(gè)方法進(jìn)行顯示圖片的初始化
//我們將要顯示的ImageView加入到ViewGroup中

public Object instantiateItem(ViewGroup container, int position) {
 // TODO Auto-generated method stub
 container.addView(mList.get(position));

 return mList.get(position);

}

@Override
//PagerAdapter只緩存三張要顯示的圖片，如果滑動(dòng)的圖片超出了緩存的范圍，就會(huì)調(diào)用這個(gè)方法，將圖片銷毀
public void destroyItem(ViewGroup container, int position, Object object) {
 // TODO Auto-generated method stub
 container.removeView(mList.get(position));
}
//獲取要滑動(dòng)的控件的數(shù)量，
public int getCount() {
 // TODO Auto-generated method stub
 return mList.size();
}

//來(lái)判斷顯示的是否是同一張照片，這個(gè)我們將兩個(gè)圖片對(duì)比 再返回
public boolean isViewFromObject(View arg0, Object arg1) {
 // TODO Auto-generated method stub
 return arg0==arg1;
}

 }

<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.support.v4.view.ViewPager
 android:id="@+id/vp"
 android:layout_width="match_parent"
 android:layout_height="200dp" />

<LinearLayout
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_alignBottom="@id/vp"
 android:background="#33000000"
 android:orientation="vertical"
 android:paddingBottom="10dp" >

 <LinearLayout
  android:id="@+id/ll_points"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:gravity="center_horizontal"
  android:orientation="horizontal"
  android:paddingBottom="10dp" >
 </LinearLayout>
</LinearLayout>

</RelativeLayout>

public class MainActivity extends Activity {

private ViewPager mVp;
//private TextView tvTitle;
private LinearLayout llPoints;
//private String[] titles;// 存放所有要顯示的標(biāo)題
private int[] images;// 存放所有要顯示的圖片資源id
private List<ImageView> list=new ArrayList<ImageView>();;// 存放要顯示在ViewPager對(duì)象中的所有Imageview對(duì)象
private int prevPosition = 0;

private Handler handler = new Handler() {

 @SuppressLint("HandlerLeak") 
 public void handleMessage(android.os.Message msg) {

  switch (msg.what) {
  case 0:
   // 得到mvp當(dāng)前頁(yè)面的索引
   int currentItem = mVp.getCurrentItem();
   // 要顯示的下一個(gè)頁(yè)面的索引
   currentItem++;
   // 設(shè)置ViewPager顯示的頁(yè)面
   mVp.setCurrentItem(currentItem % list.size());

   break;

  default:
   break;
  }
 };
};

@SuppressWarnings("deprecation")
protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 initView(); 
 // titles = getTitles();
 images=getImages();
 for (int i = 0; i < images.length; i++) {
  ImageView iv=new ImageView(this);
  iv.setBackgroundResource(images[i]);
  list.add(iv);
  //根據(jù)圖片的數(shù)量生成相對(duì)應(yīng)的數(shù)量的小圓點(diǎn)
  final View view=new View(this);
  view.setBackgroundResource(R.drawable.login__05);
  DisplayMetrics metrics=new DisplayMetrics();
  float width=TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_PX,30, metrics);
  float height=TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_PX, 30, metrics);
  LinearLayout.LayoutParams params=new LinearLayout.LayoutParams((int)width,(int)height);
  params.leftMargin=5;
  view.setLayoutParams(params);
  llPoints.addView(view);
 }
 //設(shè)置第一頁(yè)顯示的標(biāo)題
 //tvTitle.setText(titles[0]);
 //設(shè)置第一頁(yè)的時(shí)候，小圓點(diǎn)顯示的背景圖
 llPoints.getChildAt(0).setBackgroundResource(R.drawable.login__03);
 //下面封裝viewpager的適配器
 MyViewPagerAdapter adapter=new MyViewPagerAdapter(list);
 mVp.setAdapter(adapter);

 //設(shè)置ViewPager對(duì)象頁(yè)面變化時(shí)的監(jiān)聽(tīng)
 mVp.setOnPageChangeListener(new OnPageChangeListener() {

  @Override
  //當(dāng)下一個(gè)頁(yè)面被選擇的時(shí)候
  public void onPageSelected(int arg0) {
   // TODO Auto-generated method stub
   //tvTitle.setText(titles[arg0%list.size()]);

   llPoints.getChildAt(prevPosition).setBackgroundResource(R.drawable.login__05);

   llPoints.getChildAt(arg0).setBackgroundResource(R.drawable.login__03);

   //把當(dāng)前點(diǎn)位置做為下一次變化的前一個(gè)點(diǎn)的位置
   prevPosition=arg0;
  }

  @Override
  public void onPageScrolled(int arg0, float arg1, int arg2) {
   // TODO Auto-generated method stub

  }

  @Override
  public void onPageScrollStateChanged(int arg0) {
   // TODO Auto-generated method stub

  }
 });

 new Thread(new Runnable() {

  @Override
  public void run() {
   // TODO Auto-generated method stub
   while (true) {

   SystemClock.sleep(3000);

   handler.sendEmptyMessage(0);

   }
  }
 }).start();


}

private void initView() {
 // TODO Auto-generated method stub
 mVp = (ViewPager) findViewById(R.id.vp);
 //tvTitle = (TextView) findViewById(R.id.tv_title);
 llPoints = (LinearLayout) findViewById(R.id.ll_points);
}

private int[] getImages(){

 return new int[]{R.drawable.banner_01,R.drawable.banner_02,R.drawable.banner_03};


}

}