Activity转换为View和把图片转换为View

package com.example.viewpager01;

import java.util.ArrayList;

import java.util.List;





import android.app.Activity;

import android.app.LocalActivityManager;

import android.content.Context;

import android.content.Intent;

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.Window;

import android.widget.ImageView;

import android.widget.ImageView.ScaleType;





public class MainActivity extends Activity {





private ViewPager viewPager;

private List<View> viewList;

private View view1, view2, view3;  //

//Context context = null;

LocalActivityManager manager = null;  //这里要实现把Activity转换为View

private int[] ids = { R.drawable.guide_page_1, R.drawable.guide_page_2,R.drawable.guide_page_3 };//存放图片数组，这里要实现把图片转换为View

   

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);



requestWindowFeature(Window.FEATURE_NO_TITLE);

setContentView(R.layout.user_lader);





manager = new LocalActivityManager(this , true);

    manager.dispatchCreate(savedInstanceState);

       

    

    viewList=new ArrayList<View>(); 

for (int i = 0; i < ids.length; i++) {

ImageView iv = new ImageView(this);

iv.setImageResource(ids[i]);

ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(

ViewGroup.LayoutParams.FILL_PARENT,

ViewGroup.LayoutParams.FILL_PARENT);

iv.setLayoutParams(params);

iv.setScaleType(ScaleType.FIT_XY);





viewList.add(iv);

}



Intent intent = new Intent(getApplicationContext(), A.class);

viewList.add(getView("A", intent));

 





// 1,

viewPager = (ViewPager) findViewById(R.id.view_pager);







// 2,PageAdapter 必须重写的四个函数：





/*

* boolean isViewFromObject(View arg0, Object arg1) int getCount() void

* destroyItem(ViewGroup container, int position,Object object) Object

* instantiateItem(ViewGroup container, int position)

*/

viewPager.setAdapter(new PagerAdapter() {

@Override

public int getCount() {

if(viewList==null)

{

  return 0;

}

else

{

 return viewList.size();  //getCount():返回要滑动的VIew的个数

}

}





@Override

public boolean isViewFromObject(View arg0, Object arg1) {

//return arg0 == arg1;    //isViewFromObject():对于这个函数就先不做解说，大家眼下先知道它要这样重写即可了。后面我们会对它进行改写。

//System.out.println("position===isViewFromObject======"+(int)Integer.parseInt(arg1.toString())+(arg0 == viewList.get((int)Integer.parseInt(arg1.toString()))));

return arg0 == viewList.get((int)Integer.parseInt(arg1.toString()));////依据传来的key，找到view,推断与传来的參数View arg0是不是同一个视图 

}





@Override

public Object instantiateItem(ViewGroup container, int position) {

container.addView(viewList.get(position));      //做了两件事。第一：将当前视图加入到container中。第二：返回当前View

//return viewList.get(position);

//System.out.println("position===instantiateItem======"+position);

return position;  // //把当前新增视图的位置（position）作为Key传过去  

}





@Override

public void destroyItem(ViewGroup container, int position,

Object object) {   

if(position==1)

{

viewList=null;

}

else

{

 //System.out.println("position====destroyItem====="+position);

container.removeView(viewList.get(position));   //从当前container中删除指定位置（position）的View;

}

}





});

}







private View getView(String id, Intent intent) {

       return manager.startActivity(id, intent).getDecorView();

   }





}