Android中TabLayout添加小红点的示例代码

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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) {
      }
    });
  }
}