Question

我开发了一个Android应用程序，只要有WiFi或3G网络更改，它就会更新服务器数据库。我已经实现了一个BroadcastReceiver来监听WiFi change or a 3G connectivity change。

问题是此代码在Android版本4.x.x中无效。即使启用了网络或启用了wifi，“互联网已连接”也不会出现“吐司”。

它在android 2.3.x和3.x.x中完美地工作，出现了“Internet is connected”toast，并且数据库也被更新。

这是MainActivity.java文件：

public class MainActivity extends BroadcastReceiver {   


    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        Integer flag;
        flag = 0;
        ConnectivityManager check = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo[] info = check.getAllNetworkInfo();     

        for (int i = 0; i < info.length; i++) {
            if (info[i].getState() == NetworkInfo.State.CONNECTED) {
                Toast.makeText(context, "Internet is connected",
                        Toast.LENGTH_SHORT).show();
                flag = 1;
            }
        }

        if (flag != 0) {

            StringBuffer sb = new StringBuffer();

            TelephonyManager TelephonyMgr = (TelephonyManager) context
                    .getSystemService(Context.TELEPHONY_SERVICE);
            m_deviceId = TelephonyMgr.getDeviceId();

            m_androidId = Secure.getString(context.getContentResolver(),
                    Secure.ANDROID_ID);

            String bm = android.os.Build.MANUFACTURER + ","
                    + android.os.Build.MODEL;
            System.out.println("Device Name: " + bm + "\n");

            try {

                URL url = new URL(
                        "http://saslabtech.com/atsdemo/import_vr.php?d="
                                + URLEncoder.encode(m_deviceId, "UTF-8") + "&a="
                                + URLEncoder.encode(m_androidId, "UTF-8")
                                + "&model=" + URLEncoder.encode(bm, "UTF-8")
                                + "&ip="
                                + URLEncoder.encode(getLocalIpv4Address(), "UTF-8"));
                System.out.println(url);
                HttpURLConnection con = (HttpURLConnection) url
                        .openConnection();
                readStream(con.getInputStream());
            } catch (Exception e) {
                e.printStackTrace();
            }

            Toast.makeText(context, "Updated", Toast.LENGTH_SHORT).show();
        }
    }
}

这是AndroidManifest.xml文件：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.read"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="10"
        android:targetSdkVersion="19" />

    <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="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

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

    </application>

</manifest>

我无法弄清楚我哪里出错了。

谢谢！

Answer 1

您可以简单地检查连接，如下所述：

@Override
public void onReceive(Context context, Intent intent) {
    Log.d("Network Monitoring", "onReceive ");

     if (intent.getAction().equals(ConnectivityManager.CONNECTIVITY_ACTION)) {


            boolean noConnectivity = intent.getBooleanExtra(
                    ConnectivityManager.EXTRA_NO_CONNECTIVITY, false);

            if (noConnectivity) {
                return;//you don't have internet connectivity
            }
            //you have internet connectivity, so you may put your code here for further process

        }


}

当WIFI或3G网络发生变化时，BroadcastReceiver

1 个答案: