Android:ViewPager04

2022-04-30 17:02:45

　　目录结构层次：

注意点：

1.MyAdapter.java一定要 extends PagerAdapter

2.MyAdapter要覆写以下几个方法：

a.public int getCount(){}

b.public boolean isViewFromObject(View arg0, Object arg1){}

c.public Object instantiateItem(ViewGroup container, int position){}

d.public void destroyItem(ViewGroup container, int position, Object object) {}//destroyItem方法一定要注意，具体注意事项见下面的具体代码的注释。

e.public CharSequence getPageTitle(int position) {} 有title的时候才需要覆盖这个方法。

fragment_main.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context="com.wyl.view04.MainActivity$PlaceholderFragment" >

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="@string/hello_world" />

</RelativeLayout>

　　main.xml:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

    <android.support.v4.view.ViewPager

        android:id="@+id/pager"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_gravity="center" >

        <android.support.v4.view.PagerTabStrip

            android:id="@+id/tab"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content" >

        </android.support.v4.view.PagerTabStrip>

    </android.support.v4.view.ViewPager>

</LinearLayout>

　　view01.xml:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

	<TextView

	    android:id="@+id/text01"

	    android:layout_width="wrap_content"

	    android:layout_height="wrap_content"

	    android:text="易"

	    />

</LinearLayout>

　　view02.xml:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

	<TextView

	    android:id="@+id/text01"

	    android:layout_width="wrap_content"

	    android:layout_height="wrap_content"

	    android:text="华"

	    />

</LinearLayout>

　　view03.xml:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

	<TextView

	    android:id="@+id/text01"

	    android:layout_width="wrap_content"

	    android:layout_height="wrap_content"

	    android:text="kai"

	    />

</LinearLayout>

　　view04.xml:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

	<TextView

	    android:id="@+id/text01"

	    android:layout_width="wrap_content"

	    android:layout_height="wrap_content"

	    android:text="men"

	    />

</LinearLayout>

　　view05.xml:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

	<TextView

	    android:id="@+id/text01"

	    android:layout_width="wrap_content"

	    android:layout_height="wrap_content"

	    android:text="wu"

	    />

</LinearLayout>

　　MainActivity.java:

package com.wyl.view04;

import java.util.ArrayList;

import java.util.List;

import android.app.Activity;

import android.graphics.Color;

import android.os.Bundle;

import android.support.v4.view.PagerTabStrip;

import android.support.v4.view.ViewPager;

import android.view.View;

public class MainActivity extends Activity {

	List<View> listview;

	List<String> titlelist;

	ViewPager vp;

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.main);

		System.out.println("================12342142=========");

		View v01 = View.inflate(this, R.layout.view01, null);

		View v02 = View.inflate(this, R.layout.view02, null);

		View v03 = View.inflate(this, R.layout.view03, null);

		View v04 = View.inflate(this, R.layout.view04, null);

		//实例化数据源

		listview = new ArrayList<View>();

		listview.add(v01);

		listview.add(v02);

		listview.add(v03);

		listview.add(v04);

		//实例化titlelist

		titlelist = new ArrayList<String>();

		titlelist.add("背景");

		titlelist.add("设置");

		titlelist.add("朋友");

		titlelist.add("动态");

		PagerTabStrip tab = (PagerTabStrip) findViewById(R.id.tab);

		tab.setBackgroundColor(Color.YELLOW);

		tab.setTabIndicatorColor(Color.GRAY);

		tab.setDrawFullUnderline(false);

		tab.setTextColor(Color.RED);

		vp = (ViewPager) findViewById(R.id.pager);

		MyAdapter adapter = new MyAdapter(listview,titlelist);

		vp.setAdapter(adapter);

		System.out.println("09fdjfod========");

	}

}

　　MyAdapter.java

package com.wyl.view04;

import java.util.List;

import org.w3c.dom.ls.LSInput;

import android.graphics.Shader.TileMode;

import android.support.v4.view.PagerAdapter;

import android.view.View;

import android.view.ViewGroup;

public class MyAdapter extends PagerAdapter{

	List<View> listview;

	List<String> titlelist;

	public MyAdapter(List<View> listview,List<String> titlelist){

		this.listview = listview;

		this.titlelist = titlelist;

	}

	@Override

	public int getCount() {

		// TODO Auto-generated method stub

		return listview.size();

	}

	@Override

	public boolean isViewFromObject(View arg0, Object arg1) {

		// TODO Auto-generated method stub

		return arg0==arg1;

	}

	@Override

	public Object instantiateItem(ViewGroup container, int position) {

		container.addView(listview.get(position));

		System.err.println("hahha.........");

//		if(position==4){

//		}

		return listview.get(position);

	}

	@Override

	public void destroyItem(ViewGroup container, int position, Object object) {

//		super.destroyItem(container, position, object);

		container.removeView(listview.get(position));//上面一行一定要注释掉，否则会报destroyItem方法没有被覆盖

	}

	@Override

	public CharSequence getPageTitle(int position) {

		// TODO Auto-generated method stub

		System.out.println("=====9999999999");

		return titlelist.get(position);

	}

}

　　效果图：

码农公寓

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