Android   发布时间:2022-04-28  发布网站:大佬教程  code.js-code.com
大佬教程收集整理的这篇文章主要介绍了实例讲解Android中ViewPager组件的一些进阶使用技巧大佬教程大佬觉得挺不错的,现在分享给大家,也给大家做个参考。

我们经常看到使用了ViewPager的App,在每页上面都会有一个滑块来标志当前处于哪一页。在PagerView包里有android.support.v4.view.PagertitleStrip和android.support.v4.view.PagerTabStrip两个组件,可以在布局文件中,作为ViewPager的子标签,并设定相对与ViewPager的位置(比如顶部)。但这两个组件都很丑,并且标题会随着页面一起滑动,所以一般都不用。

其实实现一个滑块标志当前页面也很简单,大概需要两步:

第一步 在布局文件ViewPager的上方放置一个ImageView组件,组件可以是图片或是shape资源。注意需要把ImageView的scaleType属性设为matrix,就是说该组件的位置和大小由一个变换矩阵来控制;

第二步 在Activity中为ViewPager组件添加OnPagechangelistener监听器。在OnPagechangelistener里设定matrix,用于控制指示滑块ImageView的位置。该监听器需要实现三个方法

onPageScrollStateChanged:用于监听滑动状态的改变

onPageScrolled:用于监听滑动的动作

onPageSELEted:用于监听页面的切换,即某个页面被选中了作为当前页面

一般实现onPageSELEcted方法就可以,其他两个方法可以空着。另外为了使页面切换时滑块也是平滑地滑动,可以给滑块的ImageView指定一个TranslateAnimation动画,指定动画用setAnimation,TranlateAnimation也很简单,有个构造函数是TranslateAnimation(int beginX,int endX,int beginY,int endY),将运动矢量的起始位置和终止位置传给它就好了。

下面我们来看五个具体的例子:


一 实现ViewPager(数据源为List<View>)

1.先在main.xml文件添加一个ViewPager:

<LinearLayout xmlns:android="http://scheR_26_11845@as.android.com/apk/res/android" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" > 
 
  <android.support.v4.view.ViewPager 
    android:id="@+id/pager" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content"> 
  </android.support.v4.view.ViewPager> 
 
</LinearLayout> 

2.创建三个View:

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://scheR_26_11845@as.android.com/apk/res/android" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" 
  android:orientation="vertical" > 
 
  <TextView 
    android:id="@+id/txt1" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_gravity="center" 
    android:textSize="25dp" 
    android:text="第一页" > 
  </TextView> 
 
</LinearLayout> 

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://scheR_26_11845@as.android.com/apk/res/android" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" 
  android:orientation="vertical" > 
 
  <TextView 
    android:id="@+id/txt2" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="第二页" > 
  </TextView> 
   
</LinearLayout> 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://scheR_26_11845@as.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical" >
  
  <TextView
    android:id="@+id/txt3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="第三页" >
  </TextView>
  
</LinearLayout>

3.创建一个ViewPager适配器类:

@H_675_46@ package com.yayun.viewpagerdemo; import java.util.ArrayList; import java.util.List; import android.support.v4.view.PagerAdapter; import android.view.View; import android.view.ViewGroup; public class ViewPagerAdapter extends PagerAdapter { private List<View> lViews=new ArrayList<View>(); public ViewPagerAdapter(List<View> lViews){ this.lViews=lViews; } @Override public int getCount() { return lViews.size(); } @Override public Boolean isViewFromObject(View arg0,Object arg1) { return arg0==arg1; } @Override public Object instantiateItem(ViewGroup container,int position) { container.addView(lViews.get(position)); return lViews.get(position); } @Override public void destroyItem(ViewGroup container,int position,Object object) { container.removeView(lViews.get(position)); } }

4.MainActivity.java:

@H_675_46@ package com.yayun.viewpagerdemo; import java.util.ArrayList; import java.util.List; import android.support.v7.app.ActionBarActivity; import android.support.v7.app.ActionBar; import android.support.v4.app.Fragment; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.os.bundle; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.view.Window; import android.os.build; public class MainActivity extends ActionBarActivity { private ViewPager viewPager; private List<View> listViews=null; ViewPagerAdapter pagerAdapter; @Override protected void onCreate(Bundle savedInstanceStatE) { super.onCreate(savedInstanceStatE); requestWindowFeature(Window.FEATURE_NO_titlE); setContentView(R.layout.activity_main); viewPager=(ViewPager) findViewById(R.id.pager); listViews=new ArrayList<View>(); /** * 为Adapter创建数据源 */ View view1=View.inflate(this,R.layout.view1,null); View view2=View.inflate(this,R.layout.view2,null); View view3=View.inflate(this,R.layout.view3,null); listViews.add(view1); listViews.add(view2); listViews.add(view3); pagerAdapter=new ViewPagerAdapter(listViews) ; viewPager.setAdapter(pagerAdapter); } }

5.运行实例:

实例讲解Android中ViewPager组件的一些进阶使用技巧


可以实现翻页效果

添加标题
1.我们需要更改main.xml文件

<LinearLayout xmlns:android="http://scheR_26_11845@as.android.com/apk/res/android" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" > 
 
  <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/Strip" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_gravity="top" > 
    </android.support.v4.view.PagerTabStrip> 
  </android.support.v4.view.ViewPager> 
 
</LinearLayout> 

2.需要更改适配器文件

@H_675_46@ package com.yayun.viewpagerdemo; import java.util.ArrayList; import java.util.List; import android.support.v4.view.PagerAdapter; import android.view.View; import android.view.ViewGroup; public class ViewPagerAdapter extends PagerAdapter { private List<View> lViews=new ArrayList<View>(); private List<String> titleList=new ArrayList<String>(); public ViewPagerAdapter(List<View> lViews,List<String> titleList){ this.lViews=lViews; this.titleList=titleList; } @Override public int getCount() { return lViews.size(); } @Override public Boolean isViewFromObject(View arg0,Object object) { container.removeView(lViews.get(position)); } /** * 标题 */ @Override public CharSequence getPagetitle(int position) { // TODO Auto-generated method stub return titleList.get(position); } }

3.需要更改MainActivity.java文件

@H_675_46@ package com.yayun.viewpagerdemo; import java.util.ArrayList; import java.util.List; import android.support.v7.app.ActionBarActivity; import android.support.v7.app.ActionBar; import android.support.v4.app.Fragment; import android.support.v4.view.PagerAdapter; import android.support.v4.view.PagerTabStrip; import android.support.v4.view.ViewPager; import android.os.bundle; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.view.Window; import android.os.build; public class MainActivity extends ActionBarActivity { private ViewPager viewPager; private List<View> listViews=null; ViewPagerAdapter pagerAdapter; PagerTabStrip pagerTabStrip; private List<String> titleList; @Override protected void onCreate(Bundle savedInstanceStatE) { super.onCreate(savedInstanceStatE); requestWindowFeature(Window.FEATURE_NO_titlE); setContentView(R.layout.activity_main); viewPager=(ViewPager) findViewById(R.id.pager); pagerTabStrip=(PagerTabStrip) findViewById(R.id.Strip); listViews=new ArrayList<View>(); titleList=new ArrayList<String>(); titleList.add("第一页"); titleList.add("第二页"); titleList.add("第三页"); /** * 为Adapter创建数据源 */ View view1=View.inflate(this,null); listViews.add(view1); listViews.add(view2); listViews.add(view3); pagerAdapter=new ViewPagerAdapter(listViews,titleList) ; viewPager.setAdapter(pagerAdapter); } }

4.运行实例如下:

实例讲解Android中ViewPager组件的一些进阶使用技巧

三 实现ViewPager(数据源为List<Fragment>)
1.首先我们要创建三个Fragment:

@H_675_46@ package com.yayun.viewpagerdemo; import android.os.bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class Fragment1 extends Fragment { @Override public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceStatE) { return inflater.inflate(R.layout.view1,container,falsE); } } package com.yayun.viewpagerdemo; import android.os.bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class Fragment2 extends Fragment { @Override public View onCreateView(LayoutInflater inflater,Bundle savedInstanceStatE) { return inflater.inflate(R.layout.view2,falsE); } } package com.yayun.viewpagerdemo; import android.os.bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class Fragment3 extends Fragment { @Override public View onCreateView(LayoutInflater inflater,Bundle savedInstanceStatE) { return inflater.inflate(R.layout.view3,falsE); } }

2.设置Adapter:

@H_675_46@ package com.yayun.viewpagerdemo; import java.util.List; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentPagerAdapter; public class MyFragmentPagerAdapter extends FragmentPagerAdapter { List<Fragment> fragmentsList; List<String> titleList; public MyFragmentPagerAdapter(FragmentManager fm,List<Fragment> fragmentsList,List<String> titleList) { super(fm); this.fragmentsList=fragmentsList; this.titleList=titleList; } @Override public Fragment getItem(int arg0) { // TODO Auto-generated method stub return fragmentsList.get(arg0); } @Override public int getCount() { // TODO Auto-generated method stub return fragmentsList.size(); } @Override /** * 添加标题 */ public CharSequence getPagetitle(int position) { // TODO Auto-generated method stub return titleList.get(position); } }

3.MainActivity.java:

@H_675_46@ package com.yayun.viewpagerdemo; import java.util.ArrayList; import java.util.List; import android.graphics.Color; import android.os.bundle; import android.support.v4.app.Fragment; import android.support.v4.view.PagerTabStrip; import android.support.v4.view.ViewPager; import android.support.v4.view.ViewPager.PageTransformer; import android.support.v7.app.ActionBarActivity; import android.view.View; import android.view.Window; public class MainActivity extends ActionBarActivity { private ViewPager viewPager; private List<View> listViews=null; ViewPagerAdapter pagerAdapter; PagerTabStrip pagerTabStrip; private List<String> titleList; private List<Fragment> fragmentsList; MyFragmentPagerAdapter myFragmentPagerAdapter; @Override protected void onCreate(Bundle savedInstanceStatE) { super.onCreate(savedInstanceStatE); requestWindowFeature(Window.FEATURE_NO_titlE); setContentView(R.layout.activity_main); viewPager=(ViewPager) findViewById(R.id.pager); pagerTabStrip=(PagerTabStrip) findViewById(R.id.Strip); /** * 设置PagerTabStrip属性 */ pagerTabStrip.setBACkgroundColor(Color.GREEN); pagerTabStrip.setDrawFullUnderline(false); pagerTabStrip.setTextColor(Color.WHITE); listViews=new ArrayList<View>(); titleList=new ArrayList<String>(); fragmentsList=new ArrayList<Fragment>(); fragmentsList.add(new Fragment1()); fragmentsList.add(new Fragment2()); fragmentsList.add(new Fragment3()); titleList.add("第一页"); titleList.add("第二页"); titleList.add("第三页"); /** * 为Adapter创建数据源 */ View view1=View.inflate(this,titleList) ; myFragmentPagerAdapter=new MyFragmentPagerAdapter(getSupportFragmentManager(),fragmentsList,titleList); //viewPager.setAdapter(pagerAdapter); viewPager.setAdapter(myFragmentPagerAdapter); } }


4.运行实例:

实例讲解Android中ViewPager组件的一些进阶使用技巧

这种方法不会销毁不在当前页面页面,不能实现页卡的创建和销毁。

四 实现ViewPager(数据源为List<Fragment>实现FargmentStatePagerAdapter)常用
改变Adapter:

@H_675_46@ package com.yayun.viewpagerdemo; import java.util.List; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentPagerAdapter; import android.support.v4.app.FragmentStatePagerAdapter; import android.view.View; public class MyFragmentPagerAdapter2 extends FragmentStatePagerAdapter { List<Fragment> fragmentsList; List<String> titleList; public MyFragmentPagerAdapter2(FragmentManager fm,List<String> titleList) { super(fm); this.fragmentsList=fragmentsList; this.titleList=titleList; } @Override public Fragment getItem(int arg0) { // TODO Auto-generated method stub return fragmentsList.get(arg0); } @Override public int getCount() { // TODO Auto-generated method stub return fragmentsList.size(); } @Override /** * 添加标题 */ public CharSequence getPagetitle(int position) { // TODO Auto-generated method stub return titleList.get(position); } @Override public Object instantiateItem(View container,int position) { // TODO Auto-generated method stub return super.instantiateItem(container,position); } @Override public void destroyItem(View container,Object object) { // TODO Auto-generated method stub super.destroyItem(container,position,object); } }

将MainActivity.java中的Adapter换一下即可,它可以实现页卡的创建和销毁。

五  onPagerchangelistener 监听使用
只需要@L_623_45@mainActivity.java:

@H_675_46@ package com.yayun.viewpagerdemo; import java.util.ArrayList; import java.util.List; import android.graphics.Color; import android.os.bundle; import android.support.v4.app.Fragment; import android.support.v4.view.PagerTabStrip; import android.support.v4.view.ViewPager; import android.support.v4.view.ViewPager.onPagechangelistener; import android.support.v4.view.ViewPager.PageTransformer; import android.support.v7.app.ActionBarActivity; import android.view.View; import android.view.Window; import android.widget.Toast; public class MainActivity extends ActionBarActivity implements OnPagechangelistener { private ViewPager viewPager; private List<View> listViews=null; ViewPagerAdapter pagerAdapter; PagerTabStrip pagerTabStrip; private List<String> titleList; private List<Fragment> fragmentsList; MyFragmentPagerAdapter myFragmentPagerAdapter; @Override protected void onCreate(Bundle savedInstanceStatE) { super.onCreate(savedInstanceStatE); requestWindowFeature(Window.FEATURE_NO_titlE); setContentView(R.layout.activity_main); viewPager=(ViewPager) findViewById(R.id.pager); pagerTabStrip=(PagerTabStrip) findViewById(R.id.Strip); /** * 设置PagerTabStrip属性 */ pagerTabStrip.setBACkgroundColor(Color.GREEN); pagerTabStrip.setDrawFullUnderline(false); pagerTabStrip.setTextColor(Color.WHITE); listViews=new ArrayList<View>(); titleList=new ArrayList<String>(); fragmentsList=new ArrayList<Fragment>(); fragmentsList.add(new Fragment1()); fragmentsList.add(new Fragment2()); fragmentsList.add(new Fragment3()); titleList.add("第一页"); titleList.add("第二页"); titleList.add("第三页"); /** * 为Adapter创建数据源 */ View view1=View.inflate(this,titleList); //viewPager.setAdapter(pagerAdapter); viewPager.setAdapter(myFragmentPagerAdapter); viewPager.setOnPagechangelistener(this);//加载监听器 } @Override public void onPageScrollStateChanged(int arg0) { // TODO Auto-generated method stub } @Override public void onPageScrolled(int arg0,float arg1,int arg2) { // TODO Auto-generated method stub } @Override public void onPageSELEcted(int arg0) { Toast.makeText(this,"当前页面为"+(arg0+1),Toast.LENGTH_SHORT).show(); } }

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标签:ViewPager