[英]android how to get indicate when the internet connection is lost?
我正在開發一個Android應用程序,我希望在互聯網(wifi或分組數據連接)連接丟失時收到通知。 在我的方法中,我可以獲得連接的狀態:
private boolean isNetworkAvailable() {
ConnectivityManager connectivityManager
= (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
return activeNetworkInfo != null && activeNetworkInfo.isConnected();
}
在Manifest中有這個:
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
如何在連接丟失時自動通知我?
對於WIFI,您可以將廣播接收器注冊為:
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION);
registerReceiver(broadcastReceiver, intentFilter);
您也可以在Manifest中注冊接收器。
然后在你的接收器中:
@Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
if (action.equals(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION)) {
if (intent.getBooleanExtra(WifiManager.EXTRA_SUPPLICANT_CONNECTED, false)){
//do stuff
} else {
// wifi connection was lost
}
}
}
對於任何類型的數據連接偵聽器,您可以使用以下接收器注冊為:
<receiver android:name=".receiver.ConnectivityReceiver">
<intent-filter>
<action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
<action android:name="android.net.wifi.WIFI_STATE_CHANGED" />
</intent-filter>
</receiver>
和你的ConnectivityReceiver
:
public class ConnectivityReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
}
}
在onReceive
方法中,您可以使用此開發人員文章檢查您是否具有Internet連接。
使用以下代碼:
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import classes.NetworkUtil;
public class NetworkChangeReceiver extends BroadcastReceiver {
@Override
public void onReceive(final Context context, final Intent intent) {
boolean IsConnected = NetworkUtil.getConnectivityStatusString(context);
// Toast in here, you can retrieve other value like String from NetworkUtil
// but you need some change in NetworkUtil Class
}
}
和NetworkUtil
是:
package classes;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
public class NetworkUtil {
public static int TYPE_WIFI = 1;
public static int TYPE_MOBILE = 2;
public static int TYPE_NOT_CONNECTED = 0;
public static int getConnectivityStatus(Context context) {
ConnectivityManager cm = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
if (null != activeNetwork) {
if(activeNetwork.getType() == ConnectivityManager.TYPE_WIFI)
return TYPE_WIFI;
if(activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE)
return TYPE_MOBILE;
}
return TYPE_NOT_CONNECTED;
}
public static boolean getConnectivityStatusString(Context context) {
int conn = NetworkUtil.getConnectivityStatus(context);
boolean status = false ;
if (conn == NetworkUtil.TYPE_WIFI) {
status = true;
} else if (conn == NetworkUtil.TYPE_MOBILE) {
status = true;
} else if (conn == NetworkUtil.TYPE_NOT_CONNECTED) {
status = false;
}
return status;
}
}
並在清單文件中:
<receiver
android:name="receiver.NetworkChangeReceiver" >
<intent-filter>
<action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
</intent-filter>
</receiver>
和這個權限:
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
您需要設置廣播接收器。
將這些添加為意圖過濾器。
<intent-filter>
<action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
<action android:name="android.net.wifi.WIFI_STATE_CHANGED" />
</intent-filter>
您應該根據您的要求使用BroadcastReceivers 。 創建一個偵聽網絡更改的BroadcastReceiver。
如果網絡發生任何變化,它將自動觸發事件,您可以執行相關操作。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.