Question

我有这个简单的广播接收器正在观察数据连接的变化：

public class NetworkChangeReceiver extends BroadcastReceiver {

    private Context mContext;
    private Boolean mIsConnectedToInternet;
    private enum AlarmTypes {ALARM_TYPE_REPEATED, ALARM_TYPE_UNIQUE}

    @Override
    public void onReceive(Context context, Intent intent) {
        try {
            this.mContext = context;
            Logger.d("Connection changed!!!");
            triggerActionBasedOnTheConnectionType(isConnectedToInternet());
        } catch (Exception e) {
            Logger.e("onReceive method cannot be processed");
            e.printStackTrace();
        }
    }

    public boolean isConnectedToInternet() {
        mIsConnectedToInternet = false;
        try {
            ConnectivityManager cm =
                    (ConnectivityManager)mContext.getSystemService(Context.CONNECTIVITY_SERVICE);

            NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
            mIsConnectedToInternet = activeNetwork != null &&
                    activeNetwork.isConnectedOrConnecting();

        } catch (Exception e) {
            Logger.e("onReceive method cannot be processed");
            e.printStackTrace();
        }
        return mIsConnectedToInternet;
    }


    public void triggerActionBasedOnTheConnectionType(Boolean mIsConnectedToInternet) {
        try{
            if(mIsConnectedToInternet == true) {
                Logger.d("Device is connected");
            }
            if(mIsConnectedToInternet == false) {
                Logger.d("Device is not connected");

            }
        } catch(Exception e) {
            Logger.e("triggerActionBasedOnTheConnectionType method cannot be processed");
        }

    }
}

如果设备在所有视图中处于脱机状态，我想在操作栏下显示一些通知栏，并在全局范围内显示某些类别的所有按钮。

我怎样才能以正确的方式做到这一点？这个库有吗？

非常感谢任何建议。

Answer 1

它是一个简单的连接改变广播接收器

在 AndroidManifest.xml 文件

中注册广播接收器

<receiver android:name=".NetworkChangeBR">
   <intent-filter>
    <action android:name="android.net.conn.CONNECTIVITY_CHANGE"/>
   </intent-filter>
</receiver>

还定义了访问网络状态和拥有互联网的权限

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

接下来，使用以下内容创建NetworkChangeBR.java文件

 @Override
 public void onReceive(final Context context, Intent intent) {
   int status = getConnectivityStatus(context);
   if(status==0){
     // Offline
     // Display notification
     // Deactivate buttons
   }else{
     // Connected 
     // Also you can check for status==ConnectivityManager.TYPE_WIFI or status==ConnectivityManager.TYPE_MOBILE
   }

 }

其中 getConnectivityStatus 函数定义为

// Method to get status of network
private int getConnectivityStatus(Context context) {
    ConnectivityManager cm = (ConnectivityManager) context
            .getSystemService(Context.CONNECTIVITY_SERVICE);

    NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
    if (activeNetwork != null  && activeNetwork.isConnected()) {
        if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI || activeNetwork.getType() == ConnectivityManager.TYPE_WIMAX) {
            Log.d(LOGTAG, "Wifi");
            return ConnectivityManager.TYPE_WIFI;
        }
        if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) {
            Log.d(LOGTAG, "MOBILE");
            return ConnectivityManager.TYPE_MOBILE;
        }
    }
    Log.d(LOGTAG, "Not Connected");
    return 0;
}

在整个应用程序中全局广播和接收连接更改的最佳做法是什么？

1 个答案: