20ViewPager demo1,2:接收ViewPager展示View的使用

Demo1

MainActivity .JAVA

package com.qf.day20_viewpager_demo1;

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

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity {

    private ViewPager viewPager;

    //图片的id
    private int[] imags = {R.drawable.image1,R.drawable.image2,R.drawable.image3};

    //ViewPager可以添加View视图
    private List<ImageView> list;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

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

        //数据源  View视图  
        list = new ArrayList<ImageView>();
        //获取数据源的
        for(int i=0;i<imags.length;i++){
            //获得数据源
            ImageView iv = new ImageView(MainActivity.this);
            iv.setImageResource(imags[i]);
            list.add(iv);
            if(i==2){
                iv.setOnClickListener(new OnClickListener() {

                    @Override
                    public void onClick(View v) {
                        // TODO Auto-generated method stub
                        Toast.makeText(MainActivity.this, "点击了第三个界面", 0).show();
                    }
                });
            }
        }

        MyPagerAdapter adapter = new MyPagerAdapter();
        viewPager.setAdapter(adapter);
    }

    /**
     * 自定义的PagerAdapter
     * @author sxy
     *
     */
    private class MyPagerAdapter extends PagerAdapter{

        /**
         * 获取数据源中数据的数量
         */
        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            return list.size();
        }

        /**
         * 根据指定的下标 创建ViewPager展示的item视图
         * ViewGroup container:管理当ViewPager的视图组
         * int position:指定的下标
         */
         /**
         *  super.destroyItem(container, position, object);一定要删除 不然会有问题
         */
        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            // TODO Auto-generated method stub
            //将视图添加到视图组中
            container.addView(list.get(position));
            return list.get(position);
        }

        /**
         * 根据指定的下标  移除指定视图组中View 视图
         * 参数1:视图组
         * 参数2:指定的下标
         * 参数3:instantiateItem返回的Object对象
         */
        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            // TODO Auto-generated method stub
            //super.destroyItem(container, position, object);
            //从视图组中移除指定的视图
            container.removeView(list.get(position));

        }

        /**
         * 当前ViewPager展示的VIew对象和instantiateItem返回的对象是否是同一个
         * 
         */
        @Override
        public boolean isViewFromObject(View arg0, Object arg1) {
            // TODO Auto-generated method stub
            return arg0 == arg1 ;
        }

    }



}

布局文件

<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=".MainActivity" >

    <!-- 包名.类名 -->
    <android.support.v4.view.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />

</RelativeLayout>

Demo2

package com.qf.day20_viewpager_demo2;

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

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {

    private ViewPager viewPager;

    // View视图的集合
    private List<View> list;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        viewPager = (ViewPager) findViewById(R.id.viewPager);

        // 数据源
        list = new ArrayList<View>();
        for (int i = 1; i < 6; i++) {
            // 通过文件名称 获取资源标识
            int layoutRes = getResources().getIdentifier("pager_view" + i, "layout", getPackageName());

            // 获取当前View视图
            View view = getLayoutInflater().inflate(layoutRes, null);

            if (i == 5) {
                Button btn = (Button) view.findViewById(R.id.btn);
                btn.setOnClickListener(new OnClickListener() {

                    @Override
                    public void onClick(View v) {
                        // TODO Auto-generated method stub
                        // 跳转到主程序界面
                        // 记录已经进入到主程序 boolean 到SharedPreference
                        Toast.makeText(MainActivity.this, "点击了进入按钮", 0).show();
                    }
                });

            }

            list.add(view);

        }

        // adapter
        MyPagerAdapter adapter = new MyPagerAdapter();

        viewPager.setAdapter(adapter);
    }

    public class MyPagerAdapter extends PagerAdapter {

        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            return list.size();
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            // TODO Auto-generated method stub
            container.addView(list.get(position));
            return list.get(position);
        }

        /**
         *  super.destroyItem(container, position, object);一定要删除 不然会有问题
         */
        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            // TODO Auto-generated method stub
            // super.destroyItem(container, position, object);
            container.removeView(list.get(position));
        }

        @Override
        public boolean isViewFromObject(View arg0, Object arg1) {
            // TODO Auto-generated method stub
            return arg0 == arg1;
        }

    }

}

布局文件
activity_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=".MainActivity" >

    <android.support.v4.view.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
         />

</RelativeLayout>

pager_view1.xml:

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" 
    android:text="我是第一个界面"
    android:textColor="#f00"
    android:textSize="20sp"
    >


</TextView>

pager_view2.xml:

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" 
    android:text="我是第2个界面"
    android:textColor="#f00"
    android:textSize="20sp"
    >


</TextView>

pager_view5.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:gravity="center"
    >

    <ImageView 
        android:id="@+id/iv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_launcher"
        />
    <Button 
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="点击进入"
        />


</LinearLayout>