广播接收器未调用Internet连接检查 [英] Broadcast receiver is not calling on internet connectivity check

问题描述

我正在尝试制作一个简单的应用程序，该应用程序将通知是否有可用的互联网连接，并且互联网连接发生更改。我在互联网上找到了一些解决方案，并尝试实施它们，但是不知何故，它无法正常工作。我已在清单文件中注册的广播接收器未调用网络连接更改。

清单

 < uses-permission android：name = android.permission.INTERNET /> 
< uses-permission android：name = android.permission.ACCESS_WIFI_STATE /> 
< uses-permission android：name = android.permission.ACCESS_NETWORK_STATE /> 
<应用程序
 android：allowBackup = true 
 android：icon = @ mipmap / ic_launcher 
 android：label = @ string / app_name 
 android：roundIcon = @ mipmap / ic_launcher_round 
 android：supportsRtl = true 
 android：theme = @ style / AppTheme> 
< activity android：name =。MainActivity> 
< intent-filter> 
< action android：name = android.intent.action.MAIN /> 
 
< category android：name = android.intent.category.LAUNCHER /> 
< / intent-filter> 
< / activity> 
 
<接收器
 android：name =。NetworkStateChangeReceiver> 
<意图过滤器> 
< action android：name = android.net.conn.CONNECTIVITY_CHANGE /> 
< / intent-filter> 
< / receiver> 
 
< / application> 
  

广播接收器

  package com.gdm.internetconnectivitycheck; 
 
 import android.content.BroadcastReceiver; 
 import android.content.Context; 
 import android.content.Intent; 
 import android.net.ConnectivityManager; 
 import android.net.NetworkInfo; 
 import android.support.v4.content.LocalBroadcastManager; 
 import android.util.Log; 
 
导入静态android.content.Context.CONNECTIVITY_SERVICE; 
 
公共类NetworkStateChangeReceiver扩展了BroadcastReceiver {
 
 public static final String NETWORK_AVAILABLE_ACTION = com.gdm.retailalfageek.NetworkAvailable; 
 public static final String IS_NETWORK_AVAILABLE = isNetworkAvailable; 
 
 @Override 
 public void onReceive（上下文上下文，目的意图）{
意图networkStateIntent = new Intent（NETWORK_AVAILABLE_ACTION）; 
 networkStateIntent.putExtra（IS_NETWORK_AVAILABLE，isConnectedToInternet（context））; 
 LocalBroadcastManager.getInstance（context）.sendBroadcast（networkStateIntent）; 
 Log.e（网络可用，在收到呼叫时）; 
} 
 
私有布尔值isConnectedToInternet（上下文上下文）{
 try {
 if（context！= null）{
 ConnectivityManager ConnectivityManager =（ConnectivityManager）上下文.getSystemService（CONNECTIVITY_SERVICE）; 
 NetworkInfo networkInfo = ConnectivityManager.getActiveNetworkInfo（）; 
 return networkInfo！= null&& networkInfo.isConnected（）; 
} 
返回false； 
} catch（Exception e）{
 Log.e（NetworkStateChangeReceiver.class.getName（），e.​​getMessage（））; 
返回false； 
} 
} 
} 
  

主要活动

 包com.gdm.internetconnectivitycheck; 
 
 import android.content.BroadcastReceiver; 
 import android.content.Context; 
 import android.content.Intent; 
 import android.content.IntentFilter; 
 import android.support.v4.content.LocalBroadcastManager; 
 import android.support.v7.app.AppCompatActivity; 
 import android.os.Bundle; 
 import android.support.design.widget.Snackbar; 
 
导入静态com.gdm.internetconnectivitycheck.NetworkStateChangeReceiver.IS_NETWORK_AVAILABLE; 
 
公共类MainActivity扩展了AppCompatActivity {
 
 @Override 
 protected void onCreate（Bundle savedInstanceState）{
 super.onCreate（savedInstanceState）; 
 setContentView（R.layout.activity_main）; 
 IntentFilter intentFilter = new IntentFilter（NetworkStateChangeReceiver.NETWORK_AVAILABLE_ACTION）; 
 LocalBroadcastManager.getInstance（this）.registerReceiver（new BroadcastReceiver（）{
 @Override 
 public void onReceive（Context context，Intent intent）{
 boolean isNetworkAvailable = intent.getBooleanExtra（ IS_NETWORK_AVAILABLE，否）； 
字符串networkStatus = isNetworkAvailable？ connected： disconnected; 
 
 Snackbar.make（findViewById（R.id.main_activity），网络状态： + networkStatus ，Snackbar.LENGTH_LONG）.show（）; 
 
} 
}，intentFilter）; 
 
 
} 
} 
  

解决方案

面向Android 7.0（API级别24）及更高版本的应用必须在

$ b $广播后注册
b

  registerReceiver（BroadcastReceiver，IntentFilter）
  

< blockquote>

在清单中声明接收者无效。

CONNECTIVITY_ACTION

从Android 8.0（API级别26）开始，
系统对清单声明的接收者施加了额外的限制。
如果您的应用程序的目标是API级别26或更高级别，则不能使用
清单来声明大多数隐式广播
（未专门针对您的应用程序的广播）的接收者。当用户正在积极使用
应用程序时，您仍然可以
使用上下文注册的接收者。

来自官方文档。

您需要在运行时从活动注册CONNECTIVITY_CHANGE操作。
使用 registerReceiver 。

  IntentFilter filter = new IntentFilter（）; 
 filter.addAction（ android.net.conn.CONNECTIVITY_CHANGE）; 
 registerReceiver（new NetworkStateChangeReceiver（），filter）; 
  

别忘了注销。

I am trying to make a simple app which will notify if there is internet connection available or not on internet connectivity change. i have found some solution on internet and tries to implement them but somehow its not working. my broadcast receiver which i have registered on my manifest file is not calling on network connectivity change.

Manifest

 <uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <receiver
        android:name=".NetworkStateChangeReceiver">
        <intent-filter >
            <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
        </intent-filter>
    </receiver>

</application>

Broadcast Receiver

package com.gdm.internetconnectivitycheck;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.support.v4.content.LocalBroadcastManager;
import android.util.Log;

import static android.content.Context.CONNECTIVITY_SERVICE;

public class NetworkStateChangeReceiver extends BroadcastReceiver {

public static final String NETWORK_AVAILABLE_ACTION = "com.gdm.retailalfageek.NetworkAvailable";
public static final String IS_NETWORK_AVAILABLE = "isNetworkAvailable";

@Override
public void onReceive(Context context, Intent intent) {
    Intent networkStateIntent = new Intent(NETWORK_AVAILABLE_ACTION);
    networkStateIntent.putExtra(IS_NETWORK_AVAILABLE,  isConnectedToInternet(context));
    LocalBroadcastManager.getInstance(context).sendBroadcast(networkStateIntent);
    Log.e("Network Available ", "On receive called");
}

private boolean isConnectedToInternet(Context context) {
    try {
        if (context != null) {
            ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(CONNECTIVITY_SERVICE);
            NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
            return networkInfo != null && networkInfo.isConnected();
        }
        return false;
    } catch (Exception e) {
        Log.e(NetworkStateChangeReceiver.class.getName(), e.getMessage());
        return false;
    }
}
}

Main Activity

package com.gdm.internetconnectivitycheck;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.support.v4.content.LocalBroadcastManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.design.widget.Snackbar;

import static com.gdm.internetconnectivitycheck.NetworkStateChangeReceiver.IS_NETWORK_AVAILABLE;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    IntentFilter intentFilter = new IntentFilter(NetworkStateChangeReceiver.NETWORK_AVAILABLE_ACTION);
    LocalBroadcastManager.getInstance(this).registerReceiver(new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            boolean isNetworkAvailable = intent.getBooleanExtra(IS_NETWORK_AVAILABLE, false);
            String networkStatus = isNetworkAvailable ? "connected" : "disconnected";

            Snackbar.make(findViewById(R.id.main_activity), "Network Status: " + networkStatus, Snackbar.LENGTH_LONG).show();

        }
    }, intentFilter);


}
}

解决方案

Apps targeting Android 7.0 (API level 24) and higher must register the following broadcasts with

registerReceiver(BroadcastReceiver,IntentFilter)

Declaring a receiver in the manifest does not work.

CONNECTIVITY_ACTION

Beginning with Android 8.0 (API level 26), the system imposes additional restrictions on manifest-declared receivers. If your app targets API level 26 or higher, you cannot use the manifest to declare a receiver for most implicit broadcasts (broadcasts that do not target your app specifically). You can still use a context-registered reciever when the user is actively using your app.

directly from official doc.

you need to register for CONNECTIVITY_CHANGE action at runtime from activity. using registerReceiver.

IntentFilter filter = new IntentFilter();
filter.addAction("android.net.conn.CONNECTIVITY_CHANGE");
registerReceiver(new NetworkStateChangeReceiver(), filter);

And don't forget to unregister.

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