Question

我搜索了这个并且无法解决问题，请查看其他示例中检查的代码：

public class EntryActivity extends Activity {

public Boolean isNetAvailable(Context con)  {

    try{
        ConnectivityManager connectivityManager = (ConnectivityManager)       
                                                                  con.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo wifiInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
        NetworkInfo mobileInfo =connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
        if (wifiInfo.isConnected() || mobileInfo.isConnected()) {
            return true;
        }
    }
    catch(Exception e){
       e.printStackTrace();
    }
    return false;

当我在 onCreate 方法中调用它时，此方法效果很好，如下所示：

if (isNetAvailable(getApplicationContext())) {
        Toast.makeText(EntryActivity.this,
            "You have Internet Connection, wait a moment to sincronize" +
            "Metar's stations", Toast.LENGTH_LONG)
               .show();
         Intent myIntent = new Intent(this, MainActivity.class);
         startActivity(myIntent);

    } else {
        Toast.makeText(EntryActivity.this,
            "You Do not have Internet Connection",
                Toast.LENGTH_LONG).show();

        EntryActivity.this.startActivity(new Intent(
                Settings.ACTION_WIRELESS_SETTINGS));
            }

这仅适用于第一次互联网连接检查！问题是，如果Wifi关闭，用户应该离开应用程序或打开Wi-Fi。但是，如果他打开它，我无法访问该更改，我无法前进到我的其他活动。因此，如果在开始互联网连接状态下降时，我想继续检查用户是否将其打开以提示其他活动。我该怎么办？

Answer 1

您不需要每隔一段时间执行一次代码来检查Internet连接更改。相反，您需要在应用中定义广播接收器以侦听网络更改。

看到这个答案 How can I monitor the network connection status in Android?

Answer 2

在你的android清单中：

<receiver android:name="com.softteco.clivero.receivers.ConnectionReceiver" >
                <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
            </intent-filter>
        </receiver>

创建课程：

public class ConnectionReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        boolean newConnectionState = isConnected(context);
    }
    private boolean isConnected(Context context) {
        ConnectivityManager connectivityManager = (ConnectivityManager) context.getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo[] info = connectivityManager.getAllNetworkInfo();
        boolean ifConnected = false;
        for (int i = 0; i < info.length; i++) {
            NetworkInfo connection = info[i];
            if (connection.getState().equals(NetworkInfo.State.CONNECTED)) {
                ifConnected = true;
            }
        }
        return ifConnected;
    }

}

这是可能的变种之一。希望它会对你有所帮助。

Answer 3

这可以帮助您监控网络连接Wi-Fi，GPRS，UMTS等

public boolean isNetworkAvailable(Context context)
    {
        ConnectivityManager manager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo info = manager.getActiveNetworkInfo();
        return info!=null;
    }

还要确保您在Manifest文件中添加了必需权限，例如

    <uses-permission android:name="android.permission.INTERNET" >
    </uses-permission>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" >
    </uses-permission>
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" >
    </uses-permission>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" >
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" >
    </uses-permission>

测试Internet连接更改 - android

3 个答案: