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Android TabLayout实现京东详情效果

作者:xiangzhihong8

这篇文章主要为大家详细介绍了android TabLayout实现京东详情效果,具有一定的参考价值,感兴趣的小伙伴们可以参考一下

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。

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)


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。

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脚本之家。

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