NetworkInfo无法正确响应运行Nougat的手机上的网络更改

Question

前言：在运行6.0.1的手机上运行正常。 但是在运行7.1.1的手机上，它不是，如下所示。

build.gradle（模块：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完成以下测试 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

关闭两个，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。

Answer 1

根据android文档 ，

针对Android 7.0（API级别24）及更高版本的应用如果在其清单中声明广播接收器，则不会收到CONNECTIVITY_ACTION广播。 如果应用程序使用Context.registerReceiver（）注册其BroadcastReceiver并且该上下文仍然有效，则仍会收到CONNECTIVITY_ACTION广播。

所以你需要做的是启动一个Service ，创建一个广播接收器NetworkChangeReceiver的新实例并注册它以通过使用它来监听它到android.net.conn.CONNECTIVITY_CHANGE

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