实例

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1 导入依赖

在项目的build.gradle里面添加

implementation rootProject.ext.dependencies["design"]

在gradle的统一管理配置文件里添加
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2 Fragment

本例一共写5个Fragment，如下图所示：
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package com.yds.mainmodule.fragment;

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.yds.mainmodule.R;

/**
 * Created by yds
 * on 2019/8/13.
 */
public class HomeFragment extends Fragment {

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.main_module_fragment_home,container,false);
        return view;
    }
}

3 MainActivity

本例自定义Tab

3.1 自定义Tab

首先在项目的layout目录下创建一个自定义Tab的布局

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:padding="5dp">
    <ImageView
        android:id="@+id/home_item_iv"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        android:layout_width="20dp"
        android:layout_height="20dp"
        tools:src="@drawable/icon_tabbar_subscription_active"/>
    <TextView
        android:id="@+id/home_item_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/home_item_iv"
        android:textColor="@drawable/tabbar_subscription_text_selecter"
        android:textSize="10sp"
        tools:text="首页"/>
</android.support.constraint.ConstraintLayout>

其次添加布局

private void setTabs(String[] bottomTabTitles, int[] bottomTabImages) {
        if (bottomTabImages != null && bottomTabTitles != null) {
            for (int i = 0; i < bottomTabTitles.length; i++) {
                TabLayout.Tab tab = mBottomTabLayout.newTab();
                View view = getLayoutInflater().inflate(R.layout.main_module_layout_home_tab_item, null);
                tab.setCustomView(view);

                TextView tabTitle = view.findViewById(R.id.home_item_tv);
                tabTitle.setText(bottomTabTitles[i]);


                ImageView tabImage = view.findViewById(R.id.home_item_iv);
                tabImage.setImageResource(bottomTabImages[i]);
                if (i == 0) {
                    mBottomTabLayout.addTab(tab, true);
                } else {
                    mBottomTabLayout.addTab(tab, false);
                }
            }
        }

    }

3.2 定义FragmentPagerAdapter

package com.yds.mainmodule.adapter;

import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;

import com.yds.mainmodule.fragment.AttentionFragment;
import com.yds.mainmodule.fragment.HomeFragment;
import com.yds.mainmodule.fragment.JevelFragment;
import com.yds.mainmodule.fragment.MeFragment;
import com.yds.mainmodule.fragment.NotificationFragment;

import java.util.List;

/**
 * Created by yds
 * on 2019/9/18.
 */
public class HomeTabFragmentPagerAdapter extends FragmentPagerAdapter {
    private List<Fragment> mFragmentList;
    public HomeTabFragmentPagerAdapter(FragmentManager fm,List<Fragment> mFragmentList) {
        super(fm);
        this.mFragmentList = mFragmentList;
    }

    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }

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


}

3.3 加载Adapter并将TabLayout与ViewPager绑定

		setTabs(mTabTitles, mTabImages);
        mFragmentList = new ArrayList<>();
        mFragmentList.add(new HomeFragment());
        mFragmentList.add(new AttentionFragment());
        mFragmentList.add(new JevelFragment());
        mFragmentList.add(new NotificationFragment());
        mFragmentList.add(new MeFragment());

        mAdapter = new HomeTabFragmentPagerAdapter(getSupportFragmentManager(), mFragmentList);
        mBottomViewPager.setAdapter(mAdapter);
        mBottomViewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(mBottomTabLayout));
        mBottomTabLayout.setOnTabSelectedListener(new TabLayout.ViewPagerOnTabSelectedListener(mBottomViewPager));

4 布局文件

4.1 main布局文件

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.yds.mainmodule.mobile.views.MainActivity">

    <android.support.v4.view.ViewPager
        android:id="@+id/bottom_tab_viewpager"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent">

    </android.support.v4.view.ViewPager>

    <View
        android:id="@+id/line_view"
        android:layout_width="match_parent"
        android:layout_height="0.3dp"
        android:background="@color/f_line_gray"
        app:layout_constraintBottom_toTopOf="@+id/main_bottom_tabLayout"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/bottom_tab_viewpager"
        app:layout_constraintVertical_bias="1.0" />

    <android.support.design.widget.TabLayout
        android:id="@+id/main_bottom_tabLayout"
        android:layout_width="match_parent"
        android:layout_height="@dimen/main_module_bottom_tab_height"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/line_view"
        app:layout_constraintVertical_bias="1.0"
        app:tabIndicatorHeight="0dp"
        app:tabMode="fixed"
        app:tabSelectedTextColor="@color/f_font_tabbar_text_selected"
        app:tabTextColor="@color/f_font_tabbar_text_default">

    </android.support.design.widget.TabLayout>
</android.support.constraint.ConstraintLayout>

4.2 tab选择图片的布局

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_selected="true" android:drawable="@drawable/icon_tabbar_subscription_active"/>
    <item android:state_selected="false" android:drawable="@drawable/icon_tabbar_subscription"/>
</selector>