pageView 实现多数据循环显示.
最近项目需要用到pageView . 就是显示一些个人信息,比较多人,而且要有滑动效果,并且要实现滑到最后一个人的信息,下一个就要显示下一个人的信息.代码不多.
就一个类:
package com.qiang.test;
import java.util.ArrayList;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.app.Activity;
import android.content.Context;
public class MainActivity extends Activity {
ViewPager viewPager ;
ArrayList<LinearLayout> viewList ;
ArrayList<String> arrayList ;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ViewPager viewPager = (ViewPager) findViewById(R.id.pageView);
viewList = new ArrayList<LinearLayout>();
//设置20条数据
arrayList = new ArrayList<String>();
for(int i = 0;i<20;i++){
arrayList.add("data"+i);
}
for(int i=0;i<5;i++){
//添加的List里面
LinearLayout view = (LinearLayout) getLayoutInflater().inflate(R.layout.scan_list_item, null);
viewList.add(view);
}
PagerAdapter adapter ;
viewPager.setAdapter( adapter=new MyPageAdapter(this));
}
public class MyPageAdapter extends PagerAdapter{
Context context;
MyPageAdapter(Activity context){
this.context = context;
}
//
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
// System.out.println("移除了哪一个"+position);
container.removeView((View) object);
}
//实现循环 ,pageView在这里控制数量的显示
@Override
public int getCount() {
//假如数据不为空,返回空,不是空,返回无限大
return arrayList==null?0:Integer.MAX_VALUE;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
LinearLayout view;
//通过计算,因为要在viewList循环显示,要利用viewlist的view
if(position>viewList.size()-1){
//取余
view = viewList.get(position%viewList.size());
}else{
view= viewList.get(position);
}
//打印下位子
//因为不想用listView,但也想不要findViewById 查找子节点,所以就此方法
for (int i = 0; i <view.getChildCount(); i++) {
RelativeLayout relativeLayout = (RelativeLayout) view.getChildAt(i);
for (int j = 0; j <relativeLayout.getChildCount(); j++) {
TextView textView1 = (TextView) relativeLayout.getChildAt(j);
int dataIndex = position%arrayList.size();
textView1.setText("position:"+position+", " +"data:"+arrayList.get(dataIndex));
TextView textView2 = (TextView) relativeLayout.getChildAt(j=+1);
textView2.setText(i+":" +j);
}
}
container.addView(view);
return view;
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
// TODO Auto-generated method stub
return arg0 == arg1;
}
}
public void destroyItem(ViewGroup container, int position, Object object) {
// System.out.println("移除了哪一个"+position);
View view = (View) object;
container.removeView((View) object);
}
}
布局文件 总布局文件 demo.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<android.support.v4.view.ViewPager
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/help_viewPage"
/>
</LinearLayout> 布局文件:scan_list_item.xml 控制pageView显示的内容
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
>
<RelativeLayout
android:id="@+id/relativeLayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:orientation="vertical" >
<TextView
android:id="@+id/scan_title_name"
android:layout_width="120dp"
android:layout_height="wrap_content"
android:gravity="right"
android:text="123" />
<TextView
android:id="@+id/scan_peson_message"
android:layout_width="180dp"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_toRightOf="@id/scan_title_name"
android:gravity="left"
android:text="123" />
</RelativeLayout>
<RelativeLayout
android:id="@+id/relativeLayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:orientation="vertical" >
<TextView
android:id="@+id/scan_title_name"
android:layout_width="120dp"
android:layout_height="wrap_content"
android:gravity="right"
android:text="123" />
<TextView
android:id="@+id/scan_peson_message"
android:layout_width="180dp"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_toRightOf="@id/scan_title_name"
android:gravity="left"
android:text="123" />
</RelativeLayout>
<RelativeLayout
android:id="@+id/relativeLayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:orientation="vertical" >
<TextView
android:id="@+id/scan_title_name"
android:layout_width="120dp"
android:layout_height="wrap_content"
android:gravity="right"
android:text="123" />
<TextView
android:id="@+id/scan_peson_message"
android:layout_width="180dp"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_toRightOf="@id/scan_title_name"
android:gravity="left"
android:text="123" />
</RelativeLayout>
<RelativeLayout
android:id="@+id/relativeLayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:orientation="vertical" >
<TextView
android:id="@+id/scan_title_name"
android:layout_width="120dp"
android:layout_height="wrap_content"
android:gravity="right"
android:text="123" />
<TextView
android:id="@+id/scan_peson_message"
android:layout_width="180dp"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_toRightOf="@id/scan_title_name"
android:gravity="left"
android:text="123" />
</RelativeLayout>
</LinearLayout>