动态广播简单实现

1、定义广播接收器。

// 创建 BroadcastReceiver 实例
    private BroadcastReceiver mBroadcastReceive = new BroadcastReceiver(){
        @Override
        public void onReceive(Context context, Intent intent) {
            Log.d("Broadcast", "收到广播");
            if(intent != null){
                String stringExtra = intent.getStringExtra(KEY_RESULT);
                Toast.makeText(context,"受到广播了："+stringExtra,Toast.LENGTH_SHORT).show();
            }
        }
    };

2、注册接收器。

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(ACTION_UPLOAD_RESULT);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
//            Log.d("xx", "no going");
            registerReceiver(mBroadcastReceive,intentFilter, Context.RECEIVER_NOT_EXPORTED);
//            Log.d("xx", "no going");
        }

        Log.d("Broadcast", "接收器注册完成");
    }

3、发送广播。

    private void sendRec() {
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.d("Broadcast", "发送广播");
                Intent intent  =new Intent();
                intent.setAction(ACTION_UPLOAD_RESULT);
                intent.putExtra(KEY_RESULT,"这是发送的广播");
                intent.setPackage(getPackageName()); // 限定当前应用
                sendBroadcast(intent);
                Log.d("Broadcast", "广播已发送");
            }
        });

4 总体代码,其中广播作用域问题会导致报错：应用 com.app.broadcast 在广播发送后突然被系统终止了，导致广播无法正常接收

2025-03-28 12:05:38.957 CarrierSvcBindHelper D onHandleForceStop: [com.app.broadcast]
2025-03-28 12:05:38.959 ActivityManager V Got obituary of 3561:com.app.broadcast
2025-03-28 12:05:38.960 WindowManager I WIN DEATH: Window{... com.app.broadcast/com.app.broadcast.MainActivity}

添加intent.setPackage(getPackageName()); // 限定当前应用，问题解决:

package com.app.broadcast;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

public class MainActivity extends AppCompatActivity {
    private Button button;
    private String ACTION_UPLOAD_RESULT="my_broadcast1";
    private String KEY_RESULT="key_send1";

    private BroadcastReceiver mBroadcastReceive = new BroadcastReceiver(){
        @Override
        public void onReceive(Context context, Intent intent) {
            Log.d("Broadcast", "收到广播");
            if(intent != null){
                String stringExtra = intent.getStringExtra(KEY_RESULT);
                Toast.makeText(context,"受到广播了："+stringExtra,Toast.LENGTH_SHORT).show();
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(ACTION_UPLOAD_RESULT);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
//            Log.d("xx", "no going");
            registerReceiver(mBroadcastReceive,intentFilter, Context.RECEIVER_NOT_EXPORTED);
//            Log.d("xx", "no going");
        }

        Log.d("Broadcast", "接收器注册完成");
    }

    private void initView() {
        button = findViewById(R.id.send);
        sendRec();
    }
    private void sendRec() {
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.d("Broadcast", "发送广播");
                Intent intent  =new Intent();
                intent.setAction(ACTION_UPLOAD_RESULT);
                intent.putExtra(KEY_RESULT,"这是发送的广播");
                intent.setPackage(getPackageName()); // 限定当前应用
                sendBroadcast(intent);
                Log.d("Broadcast", "广播已发送");
            }
        });
    }
}

5、动态广播需要进行销毁：

    protected void onDestroy(){

        super.onDestroy();
        unregisterReceiver(mBroadcastReceive);
    }

结果：