Question

BroadcastReceiver没有在应用程序首次启动时工作的课程。我想在应用启动时同时检查互联网连接。请帮忙解决这个问题。

NetworkchangeListener.Java 

public class NetworkChangeListener extends BroadcastReceiver {

public static boolean isNetworkConnected= false ;

@Override
public void onReceive(Context context, Intent intent) {

    isNetworkConnected = isNetworkAvailable(context);
    if(isNetworkConnected){
        Toast.makeText(context, "Connected", Toast.LENGTH_SHORT).show();
    }
    else{
        Toast.makeText(context, "Not Connected", Toast.LENGTH_SHORT).show();
    }

}


private boolean isNetworkAvailable(Context context) {
    ConnectivityManager connectivityManager
            = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
    return activeNetworkInfo != null;
}

}

以下是我的Manifest.xml文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.dcastalia.clienttest">

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_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=".NetworkChangeListener">
            <intent-filter>
                <action android:name="android.net.conn.CONNECTIVITY_CHANGE"/>
            </intent-filter>
        </receiver>
    </application>

</manifest>

当我改变网络状态时，它工作正常但是对于第一个运行时它不起作用。

Answer 1

广播接收器仅在CONNECTIVITY_CHANGE上执行，如在intent-filters中添加。要在应用启动时检查互联网连接，您可以参考以下链接How to check if internet is available or not in app startup in android?

广播接收器在第一次应用启动时无效

1 个答案: