Android中TabLayout添加小红点

Posted 2022-10-23 DylanAndroid

转载请注明出处：http://blog.csdn.net/linglongxin24/article/details/78727255
本文出自【Dylanandroid的博客】

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# Android中TabLayout添加小红点

1.主布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    tools:context="com.bxkj.dylan.tablayoutreddot.MainActivity">
    <android.support.design.widget.TabLayout
        android:id="@+id/tabLayout"
        app:tabBackground="@android:color/white"
        app:tabTextColor="@color/colorBlack"
        app:tabSelectedTextColor="@color/colorAccent"
        app:tabMode="scrollable"
        android:layout_width="match_parent"
        android:layout_height="40dp" />
</LinearLayout>

2.要显示小红点的自定义布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="40dp"
    android:layout_gravity="center"
    android:orientation="horizontal">
    <TextView
        android:id="@+id/tv_tab_title"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:gravity="center"
        android:textColor="@color/colorBlack"
        android:textSize="15sp" />

    <TextView
        android:id="@+id/iv_tab_red"
        android:layout_gravity="right"
        android:layout_width="18dp"
        android:text="5"
        android:gravity="center"
        android:textColor="@android:color/white"
        android:layout_height="18dp"
        android:background="@drawable/red_dot" />
</LinearLayout>

3.设置TabLayout加载的各个Tab

import android.content.res.Resources;
import android.support.design.widget.TabLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

/**
 * @author dylan
 */
public class MainActivity extends AppCompatActivity 
    private TabLayout tabLayout;
    private TextView tv_tab_title;

    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tabLayout = findViewById(R.id.tabLayout);
        initData();
    

    private void initData() 
        TabLayout.Tab tab = tabLayout.newTab().setText("全部");
        tabLayout.addTab(tab);

        //待付款栏目-加载自定义显示小红点的布局
        tab = tabLayout.newTab();
        tab.setCustomView(R.layout.tab_wait_for_pay);
        tv_tab_title = tab.getCustomView().findViewById(R.id.tv_tab_title);
        tv_tab_title.setText("待付款");
        tabLayout.addTab(tab);


        tab = tabLayout.newTab().setText("待发货");
        tabLayout.addTab(tab);

        tab = tabLayout.newTab().setText("待收货");
        tabLayout.addTab(tab);

        tab = tabLayout.newTab().setText("已完成");
        tabLayout.addTab(tab);

        tab = tabLayout.newTab().setText("已取消");
        tabLayout.addTab(tab);

        //添加tabLayout选中监听
        tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() 
            @Override
            public void onTabSelected(TabLayout.Tab tab) 
                //设置选中时的文字颜色
                if (tab.getCustomView() != null) 
                    tv_tab_title.setTextColor(getResources().getColor(R.color.colorAccent));
                
            

            @Override
            public void onTabUnselected(TabLayout.Tab tab) 
                //设置未选中时的文字颜色
                if (tab.getCustomView() != null) 
                    tv_tab_title.setTextColor(getResources().getColor(R.color.colorBlack));
                
            

            @Override
            public void onTabReselected(TabLayout.Tab tab) 

            
        );