Android开发之欢迎界面标准

 import java.util.ArrayList;

 import android.app.Activity;

 import android.content.SharedPreferences;

 import android.os.Bundle;

 import android.support.v4.view.PagerAdapter;

 import android.support.v4.view.ViewPager;

 import android.view.LayoutInflater;

 import android.view.View;

 import android.view.ViewGroup;

 import android.view.ViewGroup.LayoutParams;

 //安卓应用欢迎界面标准

 public class MainActivity extends Activity {

     private ViewPager viewPager;

     private ViewPagerAdapter pagerAdapter = new ViewPagerAdapter();

     // 欢迎界面显示的视图ID

     private int[] viewsId = { R.layout.wel1, R.layout.wel2, R.layout.wel3 };

     // 缓冲界面显示的视图ID

     private int cacheId = R.layout.wel2;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         SharedPreferences shared = this.getSharedPreferences("app_global",

                 MODE_WORLD_WRITEABLE);

         viewPager = new ViewPager(this);

         viewPager.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,

                 LayoutParams.MATCH_PARENT));

         if (!shared.contains("used")) {

             pagerAdapter.setViewsId(viewsId);

             shared.edit().putBoolean("used", true).commit();

         } else {

             pagerAdapter.setViewsId(cacheId);

         }

         viewPager.setAdapter(pagerAdapter);

         // 获取最后一个视图，以便绑定事件

         View v = pagerAdapter.getLastView();

         setContentView(viewPager);

     }

     // 在其中写入当显示缓冲图片时执行的操作

     protected void onShowCachePicture() {

     }

     private class ViewPagerAdapter extends PagerAdapter {

         private ArrayList<View> viewList = new ArrayList<View>();

         @Override

         public void destroyItem(ViewGroup container, int position, Object object) {

             container.removeView(viewList.get(position));

         }

         @Override

         public Object instantiateItem(ViewGroup container, int position) {

             container.addView(viewList.get(position));

             return viewList.get(position);

         }

         @Override

         public int getCount() {

             return viewList.size();

         }

         @Override

         public boolean isViewFromObject(View arg0, Object arg1) {

             return arg0 == arg1;

         }

         public void setViewsId(int... ids) {

             LayoutInflater inflater = getLayoutInflater();

             for (int id : ids) {

                 View v = inflater.inflate(id, null);

                 viewList.add(v);

             }

         }

         public View getLastView() {

             return viewList.get(viewList.size() - 1);

         }

     }

 }