广播：（监听网络，开机状态）

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一、 需要添加的权限

<!-- 网络连接 -->
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<!-- 开机状态 -->
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

二、 静态添加开机状态的广播

    <!-- 静态注册监听开机的广播 -->
    <receiver
        android:name=".type1.service.BootReminderReceiver"
        android:enabled="true"
        android:exported="true">
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED" />
        </intent-filter>
    </receiver>

三、 activity 包下的

MainActivity.java

public class MainActivity extends AppCompatActivity {

    private NetWorkChangeReceiver netWorkChangeReceiver;

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

        // 广播接收器
        netWorkChangeReceiver = new NetWorkChangeReceiver();

        // 意图过滤器：设置网络连接变化的活动
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");

        // 注册监听网络变化的广播
        registerReceiver(netWorkChangeReceiver, intentFilter);

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        // 注销广播
        unregisterReceiver(netWorkChangeReceiver);
    }
}

四、service 包下的

1. BootReminderReceiver.java：监听开机状态的广播接收器

public class BootReminderReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        Toast.makeText(context, "开启成功", Toast.LENGTH_SHORT).show();
    }

}

2. NetWorkChangeReceiver.java：动态注册监听网络状态的广播接收器

public class NetWorkChangeReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {

        // 获取网络管理器类
        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

        // 获取网络信息，需要网络连接权限
        NetworkInfo activeNetworkInfo = null;
        if (connectivityManager != null) {
            activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
        }

        // 根据 获取到的网络信息是否有，获取到的网络信息是否可用
        if (activeNetworkInfo != null && activeNetworkInfo.isAvailable())
            Toast.makeText(context, "有网", Toast.LENGTH_SHORT).show();
        else
            Toast.makeText(context, "没网", Toast.LENGTH_SHORT).show();

    }

}