轮播图ViewPager基本写法

MainActivity

public class MainActivity extends Activity {
    private ViewPager viewpager;
    private Context context = MainActivity.this;
    // 准备要显示的图片资源
    private int[] imageIdArray = { R.drawable.iv1, R.drawable.iv2,
            R.drawable.iv3, R.drawable.iv4 };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // 找到ViewPager控件
        viewpager = (ViewPager) findViewById(R.id.viewpager);
        // 给ViewPager设置适配器，要重写下面四个方法
        viewpager.setAdapter(new PagerAdapter() {

            @Override
            public boolean isViewFromObject(View arg0, Object arg1) {
                return arg0 == arg1;
            }

            @Override
            public int getCount() {
                return imageIdArray.length;
            }

            @Override
            public Object instantiateItem(ViewGroup container, int position) {
                View view = View
                        .inflate(context, R.layout.viewpager_item, null);
                ImageView imageView = (ImageView) view.findViewById(R.id.image);
                imageView.setImageResource(imageIdArray[position]);
                // ★★★这句话很重要！！！别忘了写！！！
                ((ViewPager) container).addView(view);
                return view;
            }

            @Override
            public void destroyItem(ViewGroup container, int position,
                    Object object) {
                // ★★★这句话很重要！！！别忘了写！！！
                ((ViewPager) container).removeView((View) object);
            }
        });
    }
}

---

布局文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="185dp" >

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >
    </android.support.v4.view.ViewPager>

</RelativeLayout>

---

item

<?xml version="1.0" encoding="utf-8"?>
<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/image"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:scaleType="fitXY" >

</ImageView>

---

效果