检查互联网连接并在不可用时显示打开窗口

Question

   private boolean isNetworkConnected() {

            ConnectivityManager cm = (ConnectivityManager)
                                    getSystemService(Context.CONNECTIVITY_SERVICE);

            return cm.getActiveNetworkInfo() != null;  
      } 

我已经尝试了上面的代码，但它没有激活移动数据。

如果互联网连接不可用，我需要检查互联网连接并显示打开窗口。如何做到这一点

Answer 1

你可以这样做 如果您没有连接到 Internet，您可以显示一个警报对话框，如果用户单击 ENABLE INTERNET，则打开如下所示的 Internet 页面

AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setMessage("YOU ARE NOT CONNECTED WITH INTERNET")
                .setCancelable(false)
                .setPositiveButton("ENABLE INTERNET",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog,
                                    int id) {
                                Intent callInternetsettingIntent = new Intent(
                                        android.provider.Settings.ACTION_DATA_ROAMING_SETTINGS);

                                startActivity(callInternetsettingIntent);

                            }
                        });
        builder.setNegativeButton("CANCEL",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        dialog.cancel();

                    }

                });
        AlertDialog alert = builder.create();
        alert.show();

试试这个并告诉我。

Answer 2

检查这个Check network available in android 并在按钮或其他东西上添加监听器以使用以下代码启用 wifi：

WifiManager wifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE); 
wifiManager.setWifiEnabled(true);

确保将这些权限添加到 AndroidManifest.xml

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission>

Answer 3

尝试以下代码，非常适合我的应用程序

//在你的Activity文件中放两个方法

public boolean isMobileDataEnable() 
{
    boolean mobileDataEnabled = false; // Assume disabled
    ConnectivityManager cm = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);
    try 
    {
        Class cmClass = Class.forName(cm.getClass().getName());
        @SuppressWarnings("unchecked")
        Method method = cmClass.getDeclaredMethod("getMobileDataEnabled");
        method.setAccessible(true); // Make the method callable
        // get the setting for "mobile data"
        mobileDataEnabled = (Boolean)method.invoke(cm);
    } 
    catch (Exception e) 
    {
        // Some problem accessible private API and do whatever error handling you want here
    }
    return mobileDataEnabled;
} 

public boolean toggleMobileDataConnection(boolean ON)
{
    try 
    {
        //create instance of connectivity manager and get system connectivity service
        final ConnectivityManager conman = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);
        //create instance of class and get name of connectivity manager system service class
        final Class conmanClass  = Class.forName(conman.getClass().getName());
        //create instance of field and get mService Declared field 
        final Field iConnectivityManagerField= conmanClass.getDeclaredField("mService");
        //Attempt to set the value of the accessible flag to true
        iConnectivityManagerField.setAccessible(true);
        //create instance of object and get the value of field conman
        final Object iConnectivityManager = iConnectivityManagerField.get(conman);
        //create instance of class and get the name of iConnectivityManager field
        final Class iConnectivityManagerClass=  Class.forName(iConnectivityManager.getClass().getName());
        //create instance of method and get declared method and type
        final Method setMobileDataEnabledMethod= iConnectivityManagerClass.getDeclaredMethod("setMobileDataEnabled",Boolean.TYPE);
        //Attempt to set the value of the accessible flag to true
        setMobileDataEnabledMethod.setAccessible(true);
        //dynamically invoke the iConnectivityManager object according to your need (true/false)
        setMobileDataEnabledMethod.invoke(iConnectivityManager, ON);
    } 
    catch (Exception e)
    {
    }
    return true;
}    

//检查您的互联网连接是否关闭，如果关闭则打开移动数据

if(isMobileDataEnable())
{
    //Toast.makeText(getApplicationContext(), "Enable", Toast.LENGTH_SHORT).show(); 
}
else
{
    toggleMobileDataConnection(true);
    //Toast.makeText(getApplicationContext(), "Disable", Toast.LENGTH_SHORT).show();    
}