NetworkInfo無法正確響應運行Nougat的手機上的網絡更改

Question

前言：在運行6.0.1的手機上運行正常。 但是在運行7.1.1的手機上，它不是，如下所示。

build.gradle（模塊：app）

compileSdkVersion 25
buildToolsVersion "25.0.0"
applicationId "com.gesslar.threshvote"
minSdkVersion 19
targetSdkVersion 25

AndroidManifest.xml中

<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我有一個BroadcastReceiver，我用它來簡單地調用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());
}

從WiFi和數據連接開始我已完成以下測試 關閉WiFi

03-08 20:15:04.664 29796-29796/com.gesslar.threshvote D/NetworkUtil: NO CONNECTION INFORMATION

打開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

關閉數據：

No log line written

打開數據：

No log line written

關閉WiFi然后關閉數據：

1) 03-08 20:17:13.029 29796-29796/com.gesslar.threshvote D/NetworkUtil: NO CONNECTION INFORMATION
2) No log line written

關閉兩個，打開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.

我對結果感到非常困惑。 我在其他地方看到我應該在運行時綁定它，但是，我唯一的活動是Preferences活動。 該應用程序不具有運行時UI，而是使用后台IntentService和Notifications。

Answer 1

根據android文檔 ，

針對Android 7.0（API級別24）及更高版本的應用如果在其清單中聲明廣播接收器，則不會收到CONNECTIVITY_ACTION廣播。 如果應用程序使用Context.registerReceiver（）注冊其BroadcastReceiver並且該上下文仍然有效，則仍會收到CONNECTIVITY_ACTION廣播。

所以你需要做的是啟動一個Service ，創建一個廣播接收器NetworkChangeReceiver的新實例並注冊它以通過使用它來監聽它到android.net.conn.CONNECTIVITY_CHANGE

registerReceiver(new NetworkChangeReceiver(), new IntentFilter("android.net.conn.CONNECTIVITY_CHANGE"))