前言:这在运行 6.0.1 的手机上运行良好。但在我运行 7.1.1 的手机上,它不是,如下图所示。
build.gradle(模块:应用程序)
compileSdkVersion 25
buildToolsVersion "25.0.0"
applicationId "com.gesslar.threshvote"
minSdkVersion 19
targetSdkVersion 25
AndroidManifest.xml
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<receiver
android:name=".NetworkChangeReceiver"
android:enabled="true"
android:exported="true">
<intent-filter>
<action android:name="android.net.wifi.WIFI_STATE_CHANGED"/>
<action android:name="android.net.conn.CONNECTIVITY_CHANGE"/>
</intent-filter>
</receiver>
NetworkUtil.java 我有一个 BroadcastReceiver,我用它来简单地调用 NetworkUtil.updateNetworkStatus(context);
public static void updateNetworkStatus(Context context) {
final ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
final NetworkInfo activeNetwork = connectivityManager.getActiveNetworkInfo();
if (activeNetwork == null) {
Log.d(TAG, "NO CONNECTION INFORMATION");
return;
}
if (activeNetwork.isConnected()) {
Log.d(TAG, "WE ARE CONNECTED TO A NETWORK");
} else {
Log.d(TAG, "WE ARE NOT CONNECTED TO A NETWORK");
return;
}
Log.d(TAG, "NETWORK TYPE: " + activeNetwork.getTypeName());
}
从 WiFi 和数据连接开始我已经完成了以下测试 关闭 WiFi
03-08 20:15:04.664 29796-29796/com.gesslar.threshvote D/NetworkUtil: NO CONNECTION INFORMATION
打开 WiFi:
03-08 20:15:26.333 29796-29796/com.gesslar.threshvote D/NetworkUtil: WE ARE CONNECTED TO A NETWORK
03-08 20:15:26.333 29796-29796/com.gesslar.threshvote D/NetworkUtil: NETWORK TYPE: MOBILE
关闭数据:
No log line written
打开数据:
No log line written
关闭 WiFi,然后关闭数据:
1) 03-08 20:17:13.029 29796-29796/com.gesslar.threshvote D/NetworkUtil: NO CONNECTION INFORMATION
2) No log line written
在两者都关闭的情况下,打开 WiFi:
03-08 20:18:00.198 29796-29796/com.gesslar.threshvote D/NetworkUtil: NO CONNECTION INFORMATION
^ showed as soon as it started seeking for WiFi, but no further log line was written when WiFi became active.
我对结果感到非常困惑。我在其他地方看到我应该在运行时绑定它,但是,我唯一的活动是 Preferences 活动。该应用程序不具有运行时 UI,而是使用后台 IntentService 和 Notifications。