【收拾】通过ViewPager实现Launcher中的屏幕切换效果

package a.b;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.EditText;

public class TestViewPager extends Activity {
	private ViewPager myViewPager;

	private MyPagerAdapter myAdapter;
	
	private LayoutInflater mInflater;
	private List<View> mListViews;
	private View layout1 = null;
	private View layout2 = null;
	private View layout3 = null;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.viewpager_layout);
		myAdapter = new MyPagerAdapter();
		myViewPager = (ViewPager) findViewById(R.id.viewpagerLayout);
		myViewPager.setAdapter(myAdapter);
        
        mListViews = new ArrayList<View>();
        mInflater = getLayoutInflater();
        layout1 = mInflater.inflate(R.layout.layout1, null);
        layout2 = mInflater.inflate(R.layout.layout2, null);
        layout3 = mInflater.inflate(R.layout.layout3, null);
       
        mListViews.add(layout1);
        mListViews.add(layout2);
        mListViews.add(layout3);
        
        //初始化当前显示的view
        myViewPager.setCurrentItem(1);
        
        //初始化第二个view的信息
        EditText v2EditText = (EditText)layout2.findViewById(R.id.editText1);
        v2EditText.setText("动态设置第二个view的值");
        
        myViewPager.setOnPageChangeListener(new OnPageChangeListener() {
			
			@Override
			public void onPageSelected(int arg0) {
				Log.d("k", "onPageSelected - " + arg0);
				//activity从1到2滑动，2被加载后掉用此方法
				View v = mListViews.get(arg0);
				EditText editText = (EditText)v.findViewById(R.id.editText1);
				editText.setText("动态设置#"+arg0+"edittext控件的值");
			}
			
			@Override
			public void onPageScrolled(int arg0, float arg1, int arg2) {
				Log.d("k", "onPageScrolled - " + arg0);
				//从1到2滑动，在1滑动前调用
			}
			
			@Override
			public void onPageScrollStateChanged(int arg0) {
				Log.d("k", "onPageScrollStateChanged - " + arg0);
				//状态有三个0空闲，1是增在滑行中，2目标加载完毕
				/**
			     * Indicates that the pager is in an idle, settled state. The current page
			     * is fully in view and no animation is in progress.
			     */
			    //public static final int SCROLL_STATE_IDLE = 0;
			    /**
			     * Indicates that the pager is currently being dragged by the user.
			     */
			    //public static final int SCROLL_STATE_DRAGGING = 1;
			    /**
			     * Indicates that the pager is in the process of settling to a final position.
			     */
			    //public static final int SCROLL_STATE_SETTLING = 2;

			}
		});
        
	}
	
    private class MyPagerAdapter extends PagerAdapter{

		@Override
		public void destroyItem(View arg0, int arg1, Object arg2) {
			Log.d("k", "destroyItem");
			((ViewPager) arg0).removeView(mListViews.get(arg1));
		}

		@Override
		public void finishUpdate(View arg0) {
			Log.d("k", "finishUpdate");
		}

		@Override
		public int getCount() {
			Log.d("k", "getCount");
			return mListViews.size();
		}

		@Override
		public Object instantiateItem(View arg0, int arg1) {
			Log.d("k", "instantiateItem");
			((ViewPager) arg0).addView(mListViews.get(arg1),0);
			return mListViews.get(arg1);
		}

		@Override
		public boolean isViewFromObject(View arg0, Object arg1) {
			Log.d("k", "isViewFromObject");
			return arg0==(arg1);
		}

		@Override
		public void restoreState(Parcelable arg0, ClassLoader arg1) {
			Log.d("k", "restoreState");
		}

		@Override
		public Parcelable saveState() {
			Log.d("k", "saveState");
			return null;
		}

		@Override
		public void startUpdate(View arg0) {
			Log.d("k", "startUpdate");
		}
    	
    }
	
}