viewpager 實現左右滑動

CNNGo的項目變化很大，之前實現左右滑屏，找了很多中法，最後用了ViewFlipper + GestureDetector 實現，

裏面具體的每一個頁面佈局用了scrollview再嵌套佈局。

今天在網上找更好的辦法解決的時候，發現了viewpager，於是按照網上做了個實例，發現效果很好。太棒了。

而且手機上android market市場上面左右滑動的例子都是這樣實現的。棒。。

在C:\software\android\extras\android\support\v4這個目錄下面找到android-support-v4.jar這個jar包，引入到

工程裏面，如果你沒發現extras這個目錄。因爲你的Android SDK Manager上面的

箭頭所指的那個沒有安裝，你點擊更新安裝就可以了。於是就會有那個目錄出現。

public class ViewPagerDemoActivity extends Activity {
	
    private ViewPager awesomePager;  
    
    private Context cxt;  
    private AwesomePagerAdapter awesomeAdapter;  
      
    private LayoutInflater mInflater;  
    private List<View> mListViews;  
    
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        cxt = this;  
        
        awesomeAdapter = new AwesomePagerAdapter();  
        awesomePager = (ViewPager) findViewById(R.id.awesomepager);  
        awesomePager.setAdapter(awesomeAdapter);  
          
        mListViews = new ArrayList<View>();  
        mInflater = getLayoutInflater();  
        mListViews.add(mInflater.inflate(R.layout.layout, null));  
        mListViews.add(mInflater.inflate(R.layout.layout, null));  
        mListViews.add(mInflater.inflate(R.layout.layout, null));  
    }
    
    
    
    private class AwesomePagerAdapter extends PagerAdapter{  
        
        @Override  
        public int getCount() {  
            return mListViews.size();  
        }  
  
        /** 
         * 從指定的position創建page 
         * 
         * @param container ViewPager容器 
         * @param position The page position to be instantiated. 
         * @return 返回指定position的page，這裏不需要是一個view，也可以是其他的視圖容器. 
         */  
        @Override  
        public Object instantiateItem(View collection, final int position) {  
  
              
            ((ViewPager) collection).addView(mListViews.get(position),0);  
            final TextView tv1 = (TextView) collection.findViewById(R.id.text1);
            final TextView tv2 = (TextView) collection.findViewById(R.id.text2);
            tv1.setText("This is text1 = " + position);
            tv2.setText("This is text2 = " + position);
            tv1.setOnClickListener(new OnClickListener() {
				@Override
				public void onClick(View v) {
					Toast.makeText(ViewPagerDemoActivity.this, "This is text1 = " + position, Toast.LENGTH_LONG).show();
					tv1.setTextColor(Color.RED);
				}
			});
            
            tv2.setOnClickListener(new OnClickListener() {
				@Override
				public void onClick(View v) {
					Toast.makeText(ViewPagerDemoActivity.this, "This is text2 = " + position, Toast.LENGTH_LONG).show();
					tv2.setTextColor(Color.RED);
				}
			});
              
            return mListViews.get(position);  
        }  
  
        /** 
         * <span style="font-family:'Droid Sans';">從指定的position銷燬page</span> 
         *  
         *  
         *<span style="font-family:'Droid Sans';">參數同上</span> 
         */  
        @Override  
        public void destroyItem(View collection, int position, Object view) {  
            ((ViewPager) collection).removeView(mListViews.get(position));  
        }  
  
          
          
        @Override  
        public boolean isViewFromObject(View view, Object object) {  
            return view==(object);  
        }  
  
        @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) {}  
          
    }  
}

佈局文件如下：