防止从离线回来后写入Firebase [Android] [英] Prevent write to Firebase after back from offline [Android]

问题描述

我了解到，Firebase有能力在离线时在本地存储数据，并在设备重新联机时执行写入。然而，我想禁用这个功能在我的应用程序中的一些写入，因为我想阻止用户垃圾邮件的数据库。谢谢。根据Frank的说法，我们没有办法控制写队列。因此，我决定编写一个实用程序来检查网络连接。只有在有连接时才会执行写操作。

NetworkUtil.java：

  public class NetworkUtil {
 
 private context context; 
 
 public NetworkUtil（上下文上下文）{
 this.context = context; 
 
 $ b $ public boolean hasNetwork（）{
 ConnectivityManager mConnectivityManager =（ConnectivityManager）context.getSystemService（Context.CONNECTIVITY_SERVICE）; 
 final NetworkInfo info = mConnectivityManager.getActiveNetworkInfo（）; 
 if（info == null ||！info.isConnected（））
 return false; 
 else 
返回true; 
} 
 
} 
  

活动：

  / *检查网络* / 
 NetworkUtil networkUtil = new NetworkUtil（getApplicationContext（））; 
 boolean hasNetwork = networkUtil.hasNetwork（）; 
 $ b $ if（hasNetwork）
 / *执行写入firebase * / 
  

I understood that Firebase has the capability to store the data locally during offline, and perform write when the device is back online.

However I would like to disable this feature for some writes in my application, as I would like to prevent the users to spam the database. Thanks.

解决方案

According Frank, there is no way we can control the write queue. Thus, I decided to write a utility to check for network connection. The write will be only executed if there is a connection.

NetworkUtil.java:

public class NetworkUtil {

    private Context context;

    public NetworkUtil(Context context) {
        this.context = context;
    }

    public boolean hasNetwork() {
        ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        final NetworkInfo info = mConnectivityManager.getActiveNetworkInfo();
        if (info == null || !info.isConnected())
            return false;
        else
            return true;
    }

}

And I added this lines to my activity:

/* Check for network */
NetworkUtil networkUtil = new NetworkUtil(getApplicationContext());
boolean hasNetwork = networkUtil.hasNetwork();

if (hasNetwork)
    /* perform write to firebase */

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