Android常用控件之ViewPager

最新推荐文章于 2024-04-12 17:36:47 发布

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#viewpager #android #tapStrip

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本文将介绍如何在 Android 应用中使用 ViewPager 和自定义 adapter 实现页面切换功能，包括布局、适配器和页面间交互的实现。

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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：
这里写图片描述

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：
这里写图片描述