Android常用控件之ViewPager

概述

ViewPager并不在android的官方包中，而在第三方jar包support.V4.jar中。写一个pagerview同样要用到自定义adapter，继承于pagerAdapter。adapter中需要实现四个方法：destroyItem(ViewGroup container, int position, Object object)、getCount()、instantiateItem(ViewGroup container, int position)、isViewFromObject(View arg0, Object arg1)。

内容

主活动

public class MainActivity extends Activity {    private ViewPager mViewPager;    private LayoutInflater mInflater;    private View view1;    private View view2;    private View view3;    private List<View> mViews;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mViewPager = (ViewPager)findViewById(R.id.viewPager);        mViews = new ArrayList<>();        mInflater = getLayoutInflater();        view1 = mInflater.inflate(R.layout.newpager1, null);        view2 = mInflater.inflate(R.layout.newpager2, null);        view3 = mInflater.inflate(R.layout.newpager3, null);        mViews.add(view1);        mViews.add(view2);        mViews.add(view3);        MyPagerAdapter adapter = new MyPagerAdapter(mViews);        mViewPager.setAdapter(adapter);    }}

public class MyPagerAdapter extends PagerAdapter{    private List<View> mViews;    public MyPagerAdapter(List<View> mViews) {        super();        this.mViews = mViews;    }    @Override    public void destroyItem(ViewGroup container, int position, Object object) {        container.removeView(mViews.get(position));    }    @Override    public int getCount() {        return mViews.size();    }    @Override    public Object instantiateItem(ViewGroup container, int position) {        View view = mViews.get(position);        container.addView(view);        if(position==1){            Button button = (Button) view.findViewById(R.id.button_pager);            button.setOnClickListener(new OnClickListener() {                           @Override                public void onClick(View v) {                    Toast.makeText(v.getContext(),"点击按钮", Toast.LENGTH_SHORT).show();                    //v.getContext()得到活动                }            });        }        return view;    }    @Override    public boolean isViewFromObject(View arg0, Object arg1) {        return arg0==arg1;    }}

布局

<LinearLayout 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:background="#88ff88"    android:gravity="center"    android:orientation="vertical"    tools:context="com.chu.helloworld.MainActivity" >    <android.support.v4.view.ViewPager        android:id="@+id/viewPager"        android:layout_width="match_parent"        android:layout_height="match_parent"/></LinearLayout>

newpager1

<?xml version="1.0" encoding="UTF-8"?><LinearLayout 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" >    <ImageView         android:layout_width="match_parent"        android:layout_height="match_parent"        android:src="@drawable/dog"/></LinearLayout>

newpager2

<?xml version="1.0" encoding="UTF-8"?><LinearLayout 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" >    <Button android:id="@+id/button_pager"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="button"        android:gravity="center"/></LinearLayout>

newpager3

<?xml version="1.0" encoding="UTF-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:gravity="center"    android:layout_width="match_parent"    android:layout_height="match_parent" >    <TextView         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:textSize="30dp"        android:text="我是第三页"/></LinearLayout>

结果演示：

pagerTabStrip、注位点、和伪循环滑动的添加：
常用方法有：
setBackgroundColor()：设置背景色；
setTabIndicatorColor:设置tabIndicator的颜色；
setTextColor:设置文本颜色。
布局文件activity_main

<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:background="#88ff88"    android:gravity="center"    tools:context="com.chu.helloworld.MainActivity" >    <android.support.v4.view.ViewPager        android:id="@+id/viewPager"        android:layout_width="match_parent"        android:layout_height="match_parent">        <android.support.v4.view.PagerTabStrip            android:id="@+id/pager_tap_tripe"            android:layout_width="match_parent"            android:layout_height="wrap_content"/>    </android.support.v4.view.ViewPager>    <LinearLayout        android:id="@+id/linearlayout_container"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal"        android:gravity="center"        android:layout_alignParentBottom="true">    </LinearLayout></RelativeLayout>

MainActivity中需要修改一些地方地方：
MainActivity:

package com.chu.helloworld;import java.util.ArrayList;import java.util.List;import com.chu.helloworld.adapter.MyPagerAdapter;import android.app.Activity;import android.graphics.Color;import android.os.Bundle;import android.provider.Settings.SettingNotFoundException;import android.support.v4.view.PagerTabStrip;import android.support.v4.view.ViewPager;import android.support.v4.view.ViewPager.OnPageChangeListener;import android.view.LayoutInflater;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import android.widget.LinearLayout;public class MainActivity extends Activity {    private ViewPager mViewPager;    private LayoutInflater mInflater;    private View view1;    private View view2;    private View view3;    private List<View> mViews;    private LinearLayout mLinearLayoutContainer;    private List<ImageView> mPoints;    private PagerTabStrip mPagerTabTrip;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mViewPager = (ViewPager)findViewById(R.id.viewPager);        mViews = new ArrayList<>();        mInflater = getLayoutInflater();        view1 = mInflater.inflate(R.layout.newpager1, null);        view2 = mInflater.inflate(R.layout.newpager2, null);        view3 = mInflater.inflate(R.layout.newpager3, null);        mLinearLayoutContainer = (LinearLayout) findViewById(R.id.linearlayout_container);        mPoints = new ArrayList<>();        mPagerTabTrip = (PagerTabStrip) findViewById(R.id.pager_tap_tripe);        mPagerTabTrip.setBackgroundColor(Color.BLUE);        mPagerTabTrip.setTabIndicatorColor(Color.CYAN);        mPagerTabTrip.setTextColor(Color.LTGRAY);        mViews.add(view1);        mViews.add(view2);        mViews.add(view3);        for(int i=0;i<mViews.size();i++){            ImageView iv = new ImageView(this);            iv.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT));            iv.setPadding(7, 7, 7, 7);            iv.setImageResource(R.drawable.point_normal);            mPoints.add(iv);            mLinearLayoutContainer.addView(iv);        }        mPoints.get(0).setImageResource(R.drawable.point_select);        MyPagerAdapter adapter = new MyPagerAdapter(mViews);        mViewPager.setAdapter(adapter);        mViewPager.addOnPageChangeListener(new OnPageChangeListener() {            @Override            public void onPageSelected(int arg0) {                for(ImageView iv:mPoints){                    iv.setImageResource(R.drawable.point_normal);                }                mPoints.get(arg0%mViews.size()).setImageResource(R.drawable.point_select);            }            @Override            public void onPageScrolled(int arg0, float arg1, int arg2) {            }            @Override            public void onPageScrollStateChanged(int arg0) {            }        });        mViewPager.setCurrentItem(Integer.MAX_VALUE/2-Integer.MAX_VALUE/2%mViews.size());    }}

MyPagerAdapter中也有改变

package com.chu.helloworld.adapter;import java.util.List;import com.chu.helloworld.R;import android.support.v4.view.PagerAdapter;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.Button;import android.widget.Toast;public class MyPagerAdapter extends PagerAdapter{    private List<View> mViews;    private String titles[] = {"页面1","页面2","页面3"};    public MyPagerAdapter(List<View> mViews) {        this.mViews = mViews;    }    @Override    public CharSequence getPageTitle(int position) {        return titles[position%titles.length];    }    @Override    public void destroyItem(ViewGroup container, int position, Object object) {        //container.removeView(mViews.get(position));    }    @Override    public int getCount() {        return Integer.MAX_VALUE;    }    @Override    public Object instantiateItem(ViewGroup container, int position) {        View view = mViews.get(position%mViews.size());        if(view.getParent()!=null){            container.removeView(view);        }        container.addView(view);        if(position%mViews.size()==1){            Button button = (Button) view.findViewById(R.id.button_pager);            button.setOnClickListener(new OnClickListener() {                           @Override                public void onClick(View v) {                    Toast.makeText(v.getContext(),"点击按钮", Toast.LENGTH_SHORT).show();                    //v.getContext()得到活动                }            });        }        return view;    }    @Override    public boolean isViewFromObject(View arg0, Object arg1) {        return arg0==arg1;    }}

结果演示：