文件名：page.xml
代码如下:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<ListView
android:id="@+id/listview"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</RelativeLayout>
文件名：listviewitem.xml
代码如下:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/textView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="hello"
android:textColor="#00ff00"
/>
<ImageView
android:id="@+id/imageView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
/>
</LinearLayout>
以上的第二个布局文件 只提供给simpleAdapter
代码如下:
package com.example.learnpager2;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.app.Activity;
import android.graphics.Color;
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.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.SimpleAdapter;
public class PagerActivity extends Activity {
ViewPager viewPager;
ArrayList<View> pagesArrayList;// 添加listview 然后传给MyPagerAdapter 充当媒介
String[] strs;
String[] strs2;
ListView listView;
Button button1;
Button button2;
Button button3;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pager);
iniParams();
iniViews();
}
private void iniParams(){
pagesArrayList=new ArrayList<View>();
strs=new String[]{"a","b","c","a","b","c","a","b","c"};
strs2=new String[]{"1","2","3","1","2","3","1","2","3"};
}
private void iniViews(){
viewPager=(ViewPager)findViewById(R.id.viewPager);
//第一个页面的viewpager第1个page里的listview
LayoutInflater layoutInflater=getLayoutInflater();
listView=(ListView)
(layoutInflater.inflate(R.layout.page,null).findViewById(R.id.listview));
ArrayAdapter<String> arrrayAdapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,strs);
listView.setAdapter(arrrayAdapter);
pagesArrayList.add(listView);
//第个页面的viewpager第2个page里的listview
listView=(ListView)
(layoutInflater.inflate(R.layout.page,null).findViewById(R.id.listview));
ArrayAdapter<String> arrrayAdapter2=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,strs2);
listView.setAdapter(arrrayAdapter2);
pagesArrayList.add(listView);
//第三个面的viewpager第3个page里的listview
SimpleAdapter simpleAdapter3=new SimpleAdapter(this,getDatasForListView(),
R.layout.listviewitem,new String[]{"title","image"},new int[]{R.id.textView,R.id.imageView});
listView=(ListView)
(layoutInflater.inflate(R.layout.page, null).findViewById(R.id.listview));
listView.setAdapter(simpleAdapter3);
pagesArrayList.add(listView);
viewPager.setAdapter(new MyPagerAdapter(pagesArrayList));
viewPager.setOnPageChangeListener(new MyOnPageChangeListener());
viewPager.setCurrentItem(0);
button1=(Button)findViewById(R.id.button1);
button2=(Button)findViewById(R.id.button2);
button3=(Button)findViewById(R.id.button3);
}
public List<Map<String, Object>> getDatasForListView(){
Log.e("3", "");
List<Map<String, Object>> listMaps=new ArrayList<Map<String,Object>>();
String[] strings=new String[]{"图片1","图片2","图片3"};
int[] images=new int[]{R.drawable.p1,R.drawable.p1,R.drawable.p1};
for(int i=0;i<strings.length;i++){
listMaps.add(ListViewItemFactory.generate(new Object[]{strings[i],images[0]}));
}
return listMaps;
}
static class ListViewItemFactory{
static Map<String,Object> generate(Object[] obj){
Map<String,Object> map=new HashMap<String, Object>();
map.put("title", obj[0]);
map.put("image",obj[1]);
return map;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.pager, menu);
return true;
}
public class MyPagerAdapter extends PagerAdapter {
public List<View> mListViews;
public MyPagerAdapter(List<View> mListViews) {
this.mListViews = mListViews;
}
@Override
public void destroyItem(View arg0, int arg1, Object arg2) {
Log.d("destroyItem", ""+arg0+" "+arg1);
((ViewPager) arg0).removeView(mListViews.get(arg1));
}
@Override
public int getCount() {
return mListViews.size();
}
@Override
public Object instantiateItem(View arg0, int arg1) {
Log.d("instantiateItem", ""+arg0+" "+arg1);
try {
if(mListViews.get(arg1).getParent()==null)
((ViewPager) arg0).addView(mListViews.get(arg1), 0);
else{
// 很难理解新添加进来的view会自动绑定一个父类，由于一个儿子view不能与两个父类相关，所以得解绑
//不这样做否则会产生 viewpager java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
// 还有一种方法是viewPager.setOffscreenPageLimit(3); 这种方法不用判断parent 是不是已经存在，但多余的listview不能被destroy
((ViewGroup)mListViews.get(arg1).getParent()).removeView(mListViews.get(arg1));
((ViewPager) arg0).addView(mListViews.get(arg1), 0);
}
} catch (Exception e) {
// TODO Auto-generated catch block
Log.d("parent=", ""+mListViews.get(arg1).getParent());
e.printStackTrace();
}
return mListViews.get(arg1);
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == (arg1);
}
@Override
public void restoreState(Parcelable arg0, ClassLoader arg1) {
}
@Override
public Parcelable saveState() {
return null;
}
@Override
public void startUpdate(View arg0) {
}
}
class MyOnPageChangeListener implements OnPageChangeListener{
@Override
public void onPageScrollStateChanged (int state){
// TODO Auto-generated method stub
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
// TODO Auto-generated method stub
}
Color preColor;
@Override
public void onPageSelected(int position) {
// TODO Auto-generated method stub
Log.d("page", "pos="+position);
switch(position)
{
case 0: //button1.setBackgroundColor(0x00FF00);break;
case 1:// button1.setBackgroundColor(0xFF0000);break;
case 2:
}
}
}
}
