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Android TabLayout实现京东详情效果

程序员文章站 2024-03-06 19:06:56
google在2015的io大会上,给我们带来了更加详细的material design设计规范,同时,也给我们带来了全新的android design support l...

google在2015的io大会上,给我们带来了更加详细的material design设计规范,同时,也给我们带来了全新的android design support library,在这个support库里面,google给我们提供了更加规范的md设计风格的控件。最重要的是,android design support library的兼容性更广,直接可以向下兼容到android 2.2。

这两天需要做一个仿京东详情的页面,上面的tab切换,以前都是自己写viewpager+fragment,或者indicator的深度定制,一直想尝试一下tablayout,于是就有了下面的坑。

Android TabLayout实现京东详情效果

然后下面是我简单的实现效果(个人觉得很坑,还不如自己自定义的导航器)

Android TabLayout实现京东详情效果

添加引用库

dependencies {
 compile filetree(dir: 'libs', include: ['*.jar'])
 compile 'com.android.support:appcompat-v7:24.2.0'
 compile 'com.android.support:design:24.2.0'
 compile 'com.android.support:recyclerview-v7:24.2.0'
 compile 'com.android.support:cardview-v7:24.2.0'
}

toolbar与tablayout

我们来看一下实现的布局:

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical">


 <linearlayout
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:background="@color/c12"
  android:gravity="center_vertical"
  android:minheight="45dp"
  android:orientation="horizontal"
  android:paddingleft="15dp"
  android:paddingright="15dp">

  <imageview
   android:id="@+id/back"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:background="@drawable/back_icon" />

  <linearlayout
   android:layout_width="0dp"
   android:layout_height="match_parent"
   android:layout_weight="1"
   android:orientation="horizontal">

   <android.support.design.widget.tablayout
    android:id="@+id/tablayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:tabtextappearance="@style/tablayouttextstyle"
    app:tabgravity="center"
    app:tabmode="fixed"
    app:tabtextcolor="@color/c7"
    app:tabselectedtextcolor="@color/c8"/>

  </linearlayout>

  <imageview
   android:id="@+id/toolbar_more"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_marginleft="10dp"
   android:background="@drawable/more_icon" />
 </linearlayout>

 <view style="@style/horizontal_line" />

 <android.support.v4.view.viewpager
  android:id="@+id/viewpager"
  android:layout_width="match_parent"
  android:layout_height="0dp"
  android:layout_weight="1" />


 <view style="@style/horizontal_line" />

 <linearlayout
  android:layout_width="match_parent"
  android:layout_height="48dp"
  android:background="@color/c12"
  android:orientation="horizontal">

  <linearlayout
   android:layout_width="0dp"
   android:layout_height="match_parent"
   android:layout_weight="1">

   <textview
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:layout_weight="1"
    android:gravity="center"
    android:text="收藏"
    android:textsize="10sp" />

   <view style="@style/vertical_line" />

   <textview
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:layout_weight="1"
    android:gravity="center"
    android:text="购物车"
    android:textsize="10sp" />
  </linearlayout>

  <linearlayout
   android:layout_width="0dp"
   android:layout_height="match_parent"
   android:layout_weight="1.5"
   android:background="@color/c8"
   android:gravity="center">

   <textview
    style="@style/style_c12_s16"
    android:gravity="center"
    android:text="加入购物车" />
  </linearlayout>
 </linearlayout>
</linearlayout>

这布局文件最关键的一点就是android.support.design.widget.tablayout 标签中的app:tabmode=”scrollable”,他设置tab的模式为“可滑动的”。

其他的用法和indicator的用法差不多,都需要设置适配器,然后通过数据实现页面的适配。直接上代码

adapter

public class productdetailpageradapter extends fragmentpageradapter {

 private list<fragment> mfragments=null;
 private list<string> mtitles=null;

 public productdetailpageradapter(fragmentmanager fm, list<fragment> mfragments,list<string> mtitles) {
  super(fm);
  this.mfragments =mfragments;
  this.mtitles=mtitles;
 }

 public productdetailpageradapter(fragmentmanager fm, fragment... fragments) {
  super(fm);
  this.mfragments = arrays.aslist(fragments);
 }

 @override
 public fragment getitem(int position) {
  return mfragments.get(position);
 }

 @override
 public int getcount() {
  return mfragments.size();
 }

 @override
 public charsequence getpagetitle(int position) {
  return mtitles.get(position);
 }
}

主页面的相关逻辑,这里的fragment就是简单的fragment。

public class productdetailsactivity extends baseactivity {

 @bindview(r.id.viewpager)
 viewpager viewpager;
 @bindview(r.id.toolbar_more)
 imageview toolbarmore;
 @bindview(r.id.tablayout)
 tablayout tablayout;

 private list<fragment> mfragments;
 private string[] titles = new string[]{"商品", "详情"};
 private productdetailpageradapter productpageradapter = null;
 private morepopupwindow popupwindow = null;

 @override
 protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_product_details);
  butterknife.bind(this);
  init();
 }

 private void init() {
  initviewpager();
 }

 private void initviewpager() {
  mfragments = new arraylist<>();
  mfragments.add(new productfragment());
  mfragments.add(new productdetailfragment());

  productpageradapter = new productdetailpageradapter(getsupportfragmentmanager(), mfragments, arrays.aslist(titles));
  viewpager.setoffscreenpagelimit(2);
  viewpager.setadapter(productpageradapter);
  viewpager.setcurrentitem(1);
  tablayout.setupwithviewpager(viewpager);
 }


 @onclick(r.id.back)
 public void backclick() {
  finish();
 }

 @onclick(r.id.toolbar_more)
 public void moreclick() {
  
 }

 private adapterview.onitemclicklistener onitemclicklistener = new adapterview.onitemclicklistener() {
  @override
  public void onitemclick(adapterview<?> parent, view view, int position,
        long id) {
   popupwindow.dismiss();
  }
 };


 public static void open(context context) {
  intent intent = new intent(context, productdetailsactivity.class);
  context.startactivity(intent);
 }
}

上面的代码都比较简单不做过多的解释,在使用tablayout的时候需要注意一点:
tabmode有两个属性值:

mode_fixed:fixed tabs display all tabs concurrently and are best used with content that benefits from quick pivots between tabs.
mode_scrollable:scrollable tabs display a subset of tabs at any given moment, and can contain longer tab labels and a larger number of tabs.
mode_scrollable适合很多tabs的情况,是可以滚动的,如果你要实现京东的那种挤在一起的效果就需要mode_fixed了。

为了更好的满足开发需要,tablayout实现了自定义tablayout的样式,然后通过引入

app:tabtextappearance=""

自定义icon添加到tab

当前的tablayout没有方法让我们去添加icon,我们可以使用spannablestring结合imagespan来实现

private int[] imageresid = {
  r.drawable.ic_one,
  r.drawable.ic_two,
  r.drawable.ic_three
};
 
// ...
 
@override
public charsequence getpagetitle(int position) {
 // generate title based on item position
 // return tabtitles[position];
 drawable image = context.getresources().getdrawable(imageresid[position]);
 image.setbounds(0, 0, image.getintrinsicwidth(), image.getintrinsicheight());
 spannablestring sb = new spannablestring(" ");
 imagespan imagespan = new imagespan(image, imagespan.align_bottom);
 sb.setspan(imagespan, 0, 1, spannable.span_exclusive_exclusive);
 return sb;
}

运行,发现没有显示,这是因为tablayout创建的tab默认设置textallcaps属性为true,这阻止了imagespan被渲染出来,可以通过下面的样式文件定义来改变:

<style name="mycustomtablayout" parent="widget.design.tablayout">
  <item name="tabtextappearance">@style/mycustomtextappearance</item>
</style>
 
<style name="mycustomtextappearance" parent="textappearance.design.tab">
  <item name="textallcaps">false</item>
</style>

然后在getpagetitle方法中设置上有标题的tab

@override
public charsequence getpagetitle(int position) {
 // generate title based on item position
 drawable image = context.getresources().getdrawable(imageresid[position]);
 image.setbounds(0, 0, image.getintrinsicwidth(), image.getintrinsicheight());
 // replace blank spaces with image icon
 spannablestring sb = new spannablestring(" " + tabtitles[position]);
 imagespan imagespan = new imagespan(image, imagespan.align_bottom);
 sb.setspan(imagespan, 0, 1, spannable.span_exclusive_exclusive);
 return sb;
}

tablayout还支持自定义view,通过gettabview来设置,这里就不讲怎么实现了,有兴趣的可以自行研究。

Android TabLayout实现京东详情效果

部分代码:https://github.com/xiangzhihong/jingdongapp

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。