Android：使用ViewPager实现左右滑动切换图片 (简单版)

ViewPager，它是google SDk中自带的一个附加包的一个类，可以使视图滑动。

步骤：

1、引入android-support-v4.jar包，在主布局里加入

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

2、加载切换内容

3、ViewPager加载适配器PagerAdapter

public class MainActivity extends Activity {
private ViewPager viewPager;
private ArrayList<View> pageview;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //设置无标题栏
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        
        setContentView(R.layout.main);
        
        viewPager = (ViewPager) findViewById(R.id.viewPager);
        
        //查找布局文件用LayoutInflater.inflate
        LayoutInflater inflater =getLayoutInflater();
        View view1 = inflater.inflate(R.layout.item01, null);
        View view2 = inflater.inflate(R.layout.item02, null);
        View view3 = inflater.inflate(R.layout.item03, null);
        
        //将view装入数组
        pageview =new ArrayList<View>();
        pageview.add(view1);
        pageview.add(view2);
        pageview.add(view3);
        
        
        //数据适配器
        PagerAdapter mPagerAdapter = new PagerAdapter(){

            @Override
            //获取当前窗体界面数
            public int getCount() {
                // TODO Auto-generated method stub
                return pageview.size();
            }

            @Override
            //断是否由对象生成界面
            public boolean isViewFromObject(View arg0, Object arg1) {
                // TODO Auto-generated method stub
                return arg0==arg1;
            }
            //是从ViewGroup中移出当前View
             public void destroyItem(View arg0, int arg1, Object arg2) {  
                    ((ViewPager) arg0).removeView(pageview.get(arg1));  
                }  
            
            //返回一个对象，这个对象表明了PagerAdapter适配器选择哪个对象放在当前的ViewPager中
            public Object instantiateItem(View arg0, int arg1){
                ((ViewPager)arg0).addView(pageview.get(arg1));
                return pageview.get(arg1);                
            }
            
            
        };
        
        //绑定适配器
        viewPager.setAdapter(mPagerAdapter);

    }
}