20190918 广播 - 广播接收器

抄代码

public class MainActivity extends AppCompatActivity {

    private IntentFilter intentFilter;

    private NetworkChangeReceiver networkChangeReceiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        intentFilter = new IntentFilter();
        intentFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");
        networkChangeReceiver = new NetworkChangeReceiver();
        registerReceiver(networkChangeReceiver, intentFilter);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(networkChangeReceiver);
    }

    class NetworkChangeReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            Toast.makeText(context, "network changes", Toast.LENGTH_SHORT).show();
        }
    }
}

新建一个接收器内部类，在收到信息时提示网络变化

这里是在activity create, destroy的时候分别register, unregister接收器

再多也只能抄书了\(￣︶￣*\))

来源：https://blog.csdn.net/weixin_41654311/article/details/100996158