NetworkInfo无法正确响应运行牛轧糖的电话上的网络更改 [英] NetworkInfo is not properly responding to network changes on phone running Nougat

问题描述

前言:在运行6.0.1的电话上，此方法工作正常.但在运行7.1.1的手机上却没有，如下所示.

Preface: This is working just fine on a phone running 6.0.1. but on my phone that is running 7.1.1, it is not, as shown below.

build.gradle(Module:app)

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，可用来简单地调用NetworkUtil.updateNetworkStatus(context);

NetworkUtil.java I have a BroadcastReceiver that I use to simply call 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，我已经进行了以下测试 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

同时关闭两者，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.

我完全被结果迷住了.我看到其他地方应该在运行时绑定它，但是，我唯一的活动是首选项"活动.该应用程序不打算具有运行时UI，而是使用后台IntentService和Notifications.

I am absolutely bemused by the results. I saw somewhere else that I should bind it at runtime, however, my only activity is a Preferences activity. The app is not intended to have a runtime UI, rather using background IntentService and Notifications.

推荐答案

根据 Android文档，

针对Android 7.0(API级别24)及更高版本的应用不会收到 CONNECTIVITY_ACTION广播，如果它们声明了广播接收者 在他们的清单上.应用仍将获得CONNECTIVITY_ACTION 如果他们向其注册了BroadcastReceiver广播 Context.registerReceiver()，并且该上下文仍然有效.

Apps targeting Android 7.0 (API level 24) and higher do not receive CONNECTIVITY_ACTION broadcasts if they declare the broadcast receiver in their manifest. Apps will still receive CONNECTIVITY_ACTION broadcasts if they register their BroadcastReceiver with Context.registerReceiver() and that context is still valid.

因此，您需要做的是启动Service，创建广播接收器NetworkChangeReceiver的新实例，并使用

So what you need to do is start a Service, create a new instance of the Broadcast receiver NetworkChangeReceiver and register it to listen it to android.net.conn.CONNECTIVITY_CHANGE by using

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

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