BroadcastReceiver动态注册案例详解

public class MainActivity extends AppCompatActivity {

    private MyBroadcastReceiver receiver1;
    private NetReceiver receiver2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //1.动态注册自定义广播接收器
        receiver1 = new MyBroadcastReceiver();
        IntentFilter filter1 = new IntentFilter();
        //使用包名作为自定义广播action
        filter1.addAction("com.example.a01dynamicreGISter");
        registerReceiver(receiver1, filter1);

        //2.动态注册系统广播接收器
        receiver2 = new NetReceiver();
        IntentFilter filter2 = new IntentFilter();
        //添加切换飞行模式action
        filter2.addAction(Intent.ACTION_AIRPLANE_MODE_CHANGED);//当飞行模式打开或关闭时，接收该广播
        registerReceiver(receiver2, filter2);

        //3.点击按钮发送自定义广播
        findViewById(R.id.btn).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent("com.example.a01dynamicregister");//注意：自定义广播的发送和接受内容必须一直，否则接收不到
                sendBroadcast(intent);
            }
        });

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        //记得用完需要销毁广播接收器
        if (receiver1 != null) {
            unregisterReceiver(receiver1);
        }
        if (receiver2 != null) {
            unregisterReceiver(receiver2);
        }
    }
}


//接收自定义广播
class MyBroadcastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        Toast.makeText(context, "收到自定义广播了~~action为：" + action, Toast.LENGTH_LONG).show();
    }
}

//接收系统广播
class NetReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (Intent.ACTION_AIRPLANE_MODE_CHANGED.equals(action)) {
            Toast.makeText(context, "飞行模式发生变化~~", Toast.LENGTH_LONG).show();
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:Android="Http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/btn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="发送自定义广播"/>
    
</LinearLayout>