java - 互联网断开之前的广播接收器

Question

我想知道在 Android 上，一旦用户单击 wifi 断开连接按钮以在设备与互联网断开连接之前运行方法，是否可以获得广播，我已经使用广播接收器来捕获网络更改，但它是在互联网断开连接后执行的，我使用下面的代码:

public class InternetReceiver extends BroadcastReceiver {

@Override
public void onReceive(final Context context, final Intent intent) {
    if (isNetworkAvailable(context) && !isMyServiceRunning(MessagingService.class,context)){
        Intent i = new Intent(context,MessagingService.class);
        context.startService(i);
        Log.e("service started ","true");
    }

}

private boolean isMyServiceRunning(Class<?> serviceClass, Context c) {
    ActivityManager manager = (ActivityManager) c.getSystemService(Context.ACTIVITY_SERVICE);
    for (ActivityManager.RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {
        if (serviceClass.getName().equals(service.service.getClassName())) {
            return true;
        }
    }
    return false;
}


public boolean isNetworkAvailable(Context c) {
    ConnectivityManager connectivityManager
            = (ConnectivityManager)  c.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
    return activeNetworkInfo != null && activeNetworkInfo.isConnected();
}
}

我使用上面的代码在连接互联网后运行服务，但这只是一个示例

Answer 1

编辑:我假设您想要对用户点击 wifi 断开按钮使用react

您可以使用 Android 的 WifiManager 检查 wifi 连接的状态，它提供了一些获取有关您的 wifi 环境和连接信息的可能性。

Connectivity can be established or torn down, and dynamic information about the state of the network can be queried.

来源:http://developer.android.com/reference/android/net/wifi/WifiManager.html

看看下面的内容。我想这对你会有帮助。

WIFI_STATE_CHANGED_ACTION Broadcast intent action indicating that Wi-Fi has been enabled, disabled, enabling, disabling, or unknown.

int WIFI_STATE_DISABLED Wi-Fi is disabled.

int WIFI_STATE_DISABLING Wi-Fi is currently being disabled.