Android第一贴:主界面九宫格，点击每个宫格显示完该宫格图片后，再滑动可以显示上一个宫格图片

public class MainActivity extends Activity {

    ImageView music;
    ImageView sms;
    ImageView setting;
    private final static String MUSIC="android.intent.action.Music";
    private final static String SMS="android.intent.action.Sms";
    private final static String SETTING="android.intent.action.Setting";
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        sms=(ImageView)findViewById(R.id.sms_iv);
        sms.setOnClickListener(smsListener);
        
        music=(ImageView)findViewById(R.id.music_iv);
        music.setOnClickListener(musicListener);
        
        setting=(ImageView)findViewById(R.id.setting_iv);
        setting.setOnClickListener(settingListener);
    }

    OnClickListener musicListener=new OnClickListener() {
        
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            System.out.println("music");
            Intent intent=new Intent(MUSIC);
            intent.setClass(MainActivity.this, MySlid.class);
            startActivity(intent);
        }
    };
    
    OnClickListener smsListener=new OnClickListener() {
        
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            System.out.println("sms");
            Intent intent=new Intent(SMS);
            intent.setClass(MainActivity.this, MySlid.class);
            startActivity(intent);
        }
    };
    
    OnClickListener settingListener=new OnClickListener() {
        
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            System.out.println("setting");
            Intent intent=new Intent(SETTING);
            intent.setClass(MainActivity.this, MySlid.class);
            startActivity(intent);
        }
    };
}

public class MySlid extends Activity {

    private ViewPager mViewPager;
    private MyPagerAdapter myPagerAdapter;
    private List<View> mListViews;
    private List<View> mListViewsExt;
    private Context cxt;
    private LayoutInflater mInflater;
    int mCount;
    boolean musicFlag=false;
    int musicLen=0;
    int len=0;
    int numberofImg[]={3,5,6};
    
    public MySlid() {
        // TODO Auto-generated constructor stub
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        cxt=this;
        mInflater=getLayoutInflater();
        
        mListViews=new ArrayList<View>();
        mListViewsExt=new ArrayList<View>();
        Intent intent=getIntent();
        
        mListViews.add(mInflater.inflate(R.layout.layout1, null));
        mListViews.add(mInflater.inflate(R.layout.layout2, null));
        mListViews.add(mInflater.inflate(R.layout.layout3, null));
        mListViews.add(mInflater.inflate(R.layout.layout4, null));
        mListViews.add(mInflater.inflate(R.layout.layout5, null));
        mListViews.add(mInflater.inflate(R.layout.layout6, null));    
        len=mListViews.size();
        mListViewsExt=mListViews;
        
        if(intent.getAction()=="android.intent.action.Sms")
        {
            mListViews=mListViews.subList(0, 3);
            mListViewsExt=mListViewsExt.subList(numberofImg[0], len);
            musicFlag=true;
            musicLen=mListViews.size();
        }
        else if(intent.getAction()=="android.intent.action.Music")
        {
            mListViews=mListViews.subList(3, 5);
            mListViewsExt=mListViewsExt.subList(numberofImg[1], len);
        }
        else if(intent.getAction()=="android.intent.action.Setting")
        {
            mListViews=mListViews.subList(5, 6);
            mListViewsExt=mListViewsExt.subList(numberofImg[2], len);
        }
        myPagerAdapter=new MyPagerAdapter(cxt,mListViews);
        mViewPager=(ViewPager)findViewById(R.id.mysomepager);
        mViewPager.setAdapter(myPagerAdapter);
        mViewPager.setOnPageChangeListener(ViewPagerChangeListener);
    }
    
    OnPageChangeListener ViewPagerChangeListener=new OnPageChangeListener() {
        
        @Override
        public void onPageSelected(int arg0) {
            // TODO Auto-generated method stub
            if(arg0>mListViews.size())
            {
                mCount++;
                mListViews=mListViewsExt;
            }
        }
        
        @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
            
        }
    };
    private class MyPagerAdapter extends PagerAdapter {

        public MyPagerAdapter(Context context,List<View> views) {
               mListViews = views;
               cxt=context;   
               mCount = views.size();
              }
        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            return mCount+1;
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            // TODO Auto-generated method stub
            return view==(object);
        }

        @Override
        public Object instantiateItem(View collection, int position) {


            
               if (position >= mListViews.size()) {
                    int newPosition = position%mListViews.size();
                                
                                position = newPosition;
                                mCount++;
                   }
                   if(position <0){
                    position = -position;
                    mCount--;
                   }
                   try {
                    ((ViewPager) collection).addView(mListViews.get(position), 0);
                   } catch (Exception e) {
                         }
            //((ViewPager) collection).addView(mListViews.get(position), 0);
                   return mListViews.get(position);
        }
        
        @Override
        public void destroyItem(View collection, int position, Object view) {
            
               if (position >= mListViews.size()) {
                    int newPosition = position%mListViews.size();   
                                position = newPosition;
//            ((ViewPager) collection).removeView(mListViews.get(position));
               }
               if(position <0){
                    position = -position;
//                    ((ViewPager) collection).removeView(views.get(position));
                   }
            //((ViewPager) collection).removeView(mListViews.get(position));
        }    
        
        @Override
        public void finishUpdate(View arg0) {}
        

        @Override
        public void restoreState(Parcelable arg0, ClassLoader arg1) {}

        @Override
        public Parcelable saveState() {
            return null;
        }

        @Override
        public void startUpdate(View arg0) {}
    }
}

以下是布局文件：
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<GridLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:columnCount="3"
    android:rowCount="3" 
    android:background="@drawable/bg"> 
    <ImageView
        android:id="@+id/sms_iv"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
        android:src="@drawable/sms_iv"/>
        <ImageView
        android:id="@+id/music_iv"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
        android:src="@drawable/sms_iv"/>
        <ImageView
        android:id="@+id/setting_iv"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
        android:src="@drawable/sms_iv"/>
           <ImageView
        android:id="@+id/theme_iv"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
        android:src="@drawable/sms_iv"/>
        <ImageView
        android:id="@+id/home_iv"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
        android:src="@drawable/sms_iv"/>
        <ImageView
        android:id="@+id/photo_iv"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
        android:src="@drawable/sms_iv"/>
           <ImageView
        android:id="@+id/video_iv"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
        android:src="@drawable/sms_iv"/>
        <ImageView
        android:id="@+id/image_iv"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
        android:src="@drawable/sms_iv"/>
        <ImageView
        android:id="@+id/paly_iv"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
        android:src="@drawable/sms_iv"/>
</GridLayout>
以下为：main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
<android.support.v4.view.ViewPager
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:id="@+id/mysomepager"/>
</LinearLayout>

每个宫格下的图片都是ImageView，layout1.xml，这只是其中一张图片，其他一样，不贴了
<?xml version="1.0" encoding="utf-8"?>
    <ImageView 
        android:id="@+id/iv1" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
        android:src="@drawable/iv1"
        xmlns:android="http://schemas.android.com/apk/res/android">
        
    </ImageView>