package com.henu.broadcastsample;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private MyBroadcastReceiver receiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void send(View v) {
        //動態(tài)注冊廣播接收
        receiver = new MyBroadcastReceiver();
        String action = "henurjxy";
        IntentFilter intentFilter=new IntentFilter(action);
        registerReceiver(receiver,intentFilter);
        Intent intend = new Intent("henurjxy");
        sendBroadcast(intend);
    }
//在頁面銷毀時，注銷廣播接收者
    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(receiver);
    }
}

package com.henu.broadcastsample;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.widget.Toast;

public class MyBroadcastReceiver extends BroadcastReceiver {
public  MyBroadcastReceiver(){}
    @Override
    public void onReceive(Context context, Intent intent) {
        Toast.makeText(context,"是我發(fā)出的廣播哦",Toast.LENGTH_SHORT).show();
    }
}