Android 中的Internet 連線變更偵聽器
連線變更的預設廣播接收器監視網路可用性，但不一定會監視Internet 連線。為了解決這個限制，讓我們探索更全面的方法。
網際網路連線監控
利用下列公用程式類別來決定目前的網路連線狀態：
<code class="java">public class NetworkUtil {
public static int getConnectivityStatus(Context context) {
// Check for active network
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
// Determine network type (Wi-Fi, mobile, or not connected)
if (activeNetwork != null) {
if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI) {
return TYPE_WIFI;
} else if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) {
return TYPE_MOBILE;
}
}
return TYPE_NOT_CONNECTED;
}
// Convert network status to string representation (Wi-Fi, mobile, or not connected)
public static int getConnectivityStatusString(Context context) {
int conn = NetworkUtil.getConnectivityStatus(context);
int status = 0;
if (conn == NetworkUtil.TYPE_WIFI) {
status = NETWORK_STATUS_WIFI;
} else if (conn == NetworkUtil.TYPE_MOBILE) {
status = NETWORK_STATUS_MOBILE;
} else if (conn == NetworkUtil.TYPE_NOT_CONNECTED) {
status = NETWORK_STATUS_NOT_CONNECTED;
}
return status;
}
}</code>用於網路連線更改的廣播接收器
建立偵聽Internet 連接變更的廣播接收器：
<code class="java">public class NetworkChangeReceiver extends BroadcastReceiver {
@Override
public void onReceive(final Context context, final Intent intent) {
int status = NetworkUtil.getConnectivityStatusString(context);
if ("android.net.conn.CONNECTIVITY_CHANGE".equals(intent.getAction())) {
if (status == NetworkUtil.NETWORK_STATUS_NOT_CONNECTED) {
// Handle loss of Internet connection
} else {
// Handle recovery of Internet connection
}
}
}
}</code>AndroidManifest.xml 設定
AndroidManifest.xml 設定
<code class="xml"><uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<receiver
android:name="NetworkChangeReceiver"
android:label="NetworkChangeReceiver" >
<intent-filter>
<action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
<action android:name="android.net.wifi.WIFI_STATE_CHANGED" />
</intent-filter>
</receiver></code>以上是如何在 Android 中建立可靠的網路連線變更偵聽器？的詳細內容。更多資訊請關注PHP中文網其他相關文章！
