仿微信-界面动画(5)ViewPager详解

程墨竹

2023-12-01

ViewPager容器内有五个View，如何实现呢？
其实大体可以想象为：
钱包（ViewPager）里面，添加五张不同的钞票（Layout1.2.3.4.5）;

1.首先看页面的布局文件whatsnew_viewpager.xml

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

<FrameLayout 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:id="@+id/whatsnew_viewpager"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center" > 


        <android.support.v4.view.PagerTitleStrip
            android:id="@+id/pagertitle"
            android:layout_width="wrap_content"
            android:layout_height="0dp"
            android:layout_gravity="bottom"
            android:background="#0000"
            android:textColor="#ffff" />
    </android.support.v4.view.ViewPager>  

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal"
        > 

         <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom"
            android:layout_marginBottom="30dp" 
            android:gravity="center_horizontal"     >

            <ImageView
                android:id="@+id/page0"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"                    
                android:scaleType="matrix"
                android:src="@drawable/page_now" />
            <ImageView
                android:id="@+id/page1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="10dp"                    
                android:scaleType="matrix"
                android:src="@drawable/page" />
            <ImageView
                android:id="@+id/page2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="10dp"                    
                android:scaleType="matrix"
                android:src="@drawable/page" />
            <ImageView
                android:id="@+id/page3"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" 
                android:layout_marginLeft="10dp"                    
                android:scaleType="matrix"
                android:src="@drawable/page" />
            <ImageView
                android:id="@+id/page4"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" 
                android:layout_marginLeft="10dp"                    
                android:scaleType="matrix"
                android:src="@drawable/page" />
            <ImageView
                android:id="@+id/page5"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" 
                android:layout_marginLeft="10dp"                    
                android:scaleType="matrix"
                android:src="@drawable/page" />           

        </LinearLayout>


    </LinearLayout>


</FrameLayout>

其中的五个ImageView只是简单的五个原点—–

2.Activity中代码的实现

package cn.buaa.myweixin;

import java.util.ArrayList;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ImageView;

public class Whatsnew extends Activity {

    private ViewPager mViewPager;   
    private ImageView mPage0;
    private ImageView mPage1;
    private ImageView mPage2;
    private ImageView mPage3;
    private ImageView mPage4;
    private ImageView mPage5;

    private int currIndex = 0;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.whatsnew_viewpager);
        mViewPager = (ViewPager)findViewById(R.id.whatsnew_viewpager);        
        mViewPager.setOnPageChangeListener(new MyOnPageChangeListener());


        mPage0 = (ImageView)findViewById(R.id.page0);
        mPage1 = (ImageView)findViewById(R.id.page1);
        mPage2 = (ImageView)findViewById(R.id.page2);
        mPage3 = (ImageView)findViewById(R.id.page3);
        mPage4 = (ImageView)findViewById(R.id.page4);
        mPage5 = (ImageView)findViewById(R.id.page5);

        //将要分页显示的View装入数组中
        LayoutInflater mLi = LayoutInflater.from(this);
        View view1 = mLi.inflate(R.layout.whats1, null);
        View view2 = mLi.inflate(R.layout.whats2, null);
        View view3 = mLi.inflate(R.layout.whats3, null);
        View view4 = mLi.inflate(R.layout.whats4, null);
        View view5 = mLi.inflate(R.layout.whats5, null);
        View view6 = mLi.inflate(R.layout.whats6, null);

      //每个页面的view数据
        final ArrayList<View> views = new ArrayList<View>();
        views.add(view1);
        views.add(view2);
        views.add(view3);
        views.add(view4);
        views.add(view5);
        views.add(view6);

        //填充ViewPager的数据适配器
        PagerAdapter mPagerAdapter = new PagerAdapter() {

            @Override
            public boolean isViewFromObject(View arg0, Object arg1) {
                return arg0 == arg1;
            }

            @Override
            public int getCount() {
                return views.size();
            }

            @Override
            public void destroyItem(View container, int position, Object object) {
                ((ViewPager)container).removeView(views.get(position));
            }


            //添加View到ViewPager-----效果其实就是一本含有五页纸的书本
            @Override
            public Object instantiateItem(View container, int position) {
                ((ViewPager)container).addView(views.get(position));
                return views.get(position);
            }
        };

        mViewPager.setAdapter(mPagerAdapter);
    }    

//滑动屏幕（翻页）的时候五个ImageView小点的状态进行改变
    public class MyOnPageChangeListener implements OnPageChangeListener {
        @Override
        public void onPageSelected(int arg0) {
            switch (arg0) {
            case 0:             
                mPage0.setImageDrawable(getResources().getDrawable(R.drawable.page_now));
                mPage1.setImageDrawable(getResources().getDrawable(R.drawable.page));
                break;
            case 1:
                mPage1.setImageDrawable(getResources().getDrawable(R.drawable.page_now));
                mPage0.setImageDrawable(getResources().getDrawable(R.drawable.page));
                mPage2.setImageDrawable(getResources().getDrawable(R.drawable.page));
                break;
            case 2:
                mPage2.setImageDrawable(getResources().getDrawable(R.drawable.page_now));
                mPage1.setImageDrawable(getResources().getDrawable(R.drawable.page));
                mPage3.setImageDrawable(getResources().getDrawable(R.drawable.page));
                break;
            case 3:
                mPage3.setImageDrawable(getResources().getDrawable(R.drawable.page_now));
                mPage4.setImageDrawable(getResources().getDrawable(R.drawable.page));
                mPage2.setImageDrawable(getResources().getDrawable(R.drawable.page));
                break;
            case 4:
                mPage4.setImageDrawable(getResources().getDrawable(R.drawable.page_now));
                mPage3.setImageDrawable(getResources().getDrawable(R.drawable.page));
                mPage5.setImageDrawable(getResources().getDrawable(R.drawable.page));
                break;
            case 5:
                mPage5.setImageDrawable(getResources().getDrawable(R.drawable.page_now));
                mPage4.setImageDrawable(getResources().getDrawable(R.drawable.page));
                break;
            }
            currIndex = arg0;
            //animation.setFillAfter(true);// True:图片停在动画结束位置
            //animation.setDuration(300);
            //mPageImg.startAnimation(animation);
        }
        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2) {
        }

        @Override
        public void onPageScrollStateChanged(int arg0) {
        }
    }
    public void startbutton(View v) {  
        Intent intent = new Intent();
        intent.setClass(Whatsnew.this,WhatsnewDoor.class);
        startActivity(intent);
        this.finish();
      }  

}

五个页面的监听其实不用（因为只是监听了五个ImageView的状态的改变）
最重要的代码段其实是

 //填充ViewPager的数据适配器
        PagerAdapter mPagerAdapter = new PagerAdapter() {

            @Override
            public boolean isViewFromObject(View arg0, Object arg1) {
                return arg0 == arg1;
            }

            @Override
            public int getCount() {
                return views.size();
            }

            @Override
            public void destroyItem(View container, int position, Object object) {
                ((ViewPager)container).removeView(views.get(position));
            }


            //添加View到ViewPager-----效果其实就是一本含有五页纸的书本
            @Override
            public Object instantiateItem(View container, int position) {
                ((ViewPager)container).addView(views.get(position));
                return views.get(position);
            }
        };

View view1 = mLi.inflate(R.layout.whats1, null);
        View view2 = mLi.inflate(R.layout.whats2, null);
        View view3 = mLi.inflate(R.layout.whats3, null);
        View view4 = mLi.inflate(R.layout.whats4, null);
        View view5 = mLi.inflate(R.layout.whats5, null);
        View view6 = mLi.inflate(R.layout.whats6, null);

这五个Layout其实是页面的内容（也就是一本书里面五张纸的页面布局）

效果图呢，就不贴上去了，可以参照QQ版本更新后，你要面对的好多滑屏到主界面的那段—–

仿微信-界面动画(5)ViewPager详解

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