1、发送广播的代码

//1、fragment中的使用
 Intent redIntent=new Intent("com.asia5b.red.my.a5b");
 getActivity().sendBroadcast(redIntent); //发送小红点广播
//2、activity中的使用
 Intent redIntent=new Intent("com.asia5b.red.shoppong.card");
 sendBroadcast(redIntent); //发送小红点广播

2、注册广播的代码

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
   //小红点显示
   //创建这个方法，开启广播监听
   registerRedBroadrecevicer();
}


//小红点广播
public RedBoradCastReceiver redReceiver;
public void registerRedBroadrecevicer() {
    //获取广播对象
    redReceiver = new RedBoradCastReceiver(this);
    //创建意图过滤器
    IntentFilter redFilter = new IntentFilter();
   //添加动作
    redFilter.addAction("com.asia5b.red.shoppong.card");
    redFilter.addAction("com.asia5b.red.my.a5b");
    registerReceiver(redReceiver, redFilter);
}

3、反注册 销毁广播的代码

@Override
protected void onDestroy() {
   unregisterReceiver(redReceiver);
   super.onDestroy();
}

4、重写广播接收器，做自己的逻辑操作

public class RedBoradCastReceiver extends BroadcastReceiver {

    private MainActivity mainActivity;

    public RedBoradCastReceiver(MainActivity mainActivity) {
        this.mainActivity = mainActivity;
    }

    @Override
    public void onReceive(Context context, final Intent intent) {
        Log.e("bbbbb","aaaaaaaaaaaaaa");
        mainActivity.runOnUiThread(new Runnable() {
            @Override
            public void run() {

                if ("com.asia5b.red.shoppong.card".equals(intent.getAction())){
                    mainActivity.shopping_card_red_iv.setVisibility(View.VISIBLE);
                }else if ("com.asia5b.red.my.a5b".equals(intent.getAction())){
                    mainActivity.my_a5b_red_iv.setVisibility(View.VISIBLE);
                }
            }
        });
    }
}