Broadcast Receiver(广播) -android-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_58124208/article/details/126368283

本文介绍了Android中动态注册和静态注册广播接收器的使用方法，包括监听网络变化和实现开机启动功能。同时，还展示了如何发送自定义广播并接收。动态注册在onCreate()中进行，onDestroy()时需取消注册。静态注册则通过在Manifest.xml中配置实现开机启动。此外，还给出了发送自定义广播的代码示例。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

一.动态注册广播-监听网络变化

public class MainActivity extends AppCompatActivity {


    private IntentFilter intentFilter;
    private MyBroadcast myBroadcast;

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

        intentFilter = new IntentFilter();
        intentFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");//这个action不能错
        myBroadcast = new MyBroadcast();
        registerReceiver(myBroadcast,intentFilter);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(myBroadcast);//记得动态注册的关闭一定要取消注册
    }


    class MyBroadcast extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
            if (networkInfo != null &&networkInfo.isAvailable()){
                Toast.makeText(context, "网络可用", Toast.LENGTH_SHORT).show();
            }else {
                Toast.makeText(context, "网络不可用", Toast.LENGTH_SHORT).show();
            }
        }
    }
}

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

运行吧网络关闭可以看见效果，建议真机运行

二.静态注册广播-实现开机启动

在包下-new -other-Broadcast Recevier创建

然后修改它的内容看效果

public class MyReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO: This method is called when the BroadcastReceiver is receiving
        Toast.makeText(context, "你好，我是开机自启动的", Toast.LENGTH_SHORT).show();
    }
}

然后再manifest文件里配置

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>

 <receiver
            android:name=".MyReceiver"
            android:enabled="true"
            android:exported="true">

            <intent-filter>
               <action android:name="android.intent.action.BOOT_COMPLETED"/>
            </intent-filter>
        </receiver>

运行后关机再开机就可以看见效果了

三.发送自定义广播

与第二个差不多，就是action变成我们自己定义的

  <receiver
            android:name=".MyReceiver2"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action android:name="aaa" />
            </intent-filter>

        </receiver>

 Button btn=findViewById(R.id.aa);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent("aaa");
                sendBroadcast(intent);
                Log.i("TAG", "onClick: **********************");
            }
        });