Android中TabLayout添加小红点的示例代码

<?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>

<?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>

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) {      }    });  }}