How to enable mobile data on/off programmatically

问题:

This question already has an answer here:

• The setMobileDataEnabled method is no longer callable as of Android L and later 8 answers

In android how to enable mobile data on and off in android 4.4 and above versions. I have used this code but it is not working in android 4.4 and above versions:

private void setMobileDataEnabled(Context context, boolean enabled){
    final ConnectivityManager conman = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    final Class conmanClass = Class.forName(conman.getClass().getName());
    final Field iConnectivityManagerField = conmanClass.getDeclaredField("mService");
    iConnectivityManagerField.setAccessible(true);
    final Object iConnectivityManager = iConnectivityManagerField.get(conman);
    final Class iConnectivityManagerClass = Class.forName(iConnectivityManager.getClass().getName());
    final Method setMobileDataEnabledMethod = iConnectivityManagerClass.getDeclaredMethod("setMobileDataEnabled", Boolean.TYPE);
    setMobileDataEnabledMethod.setAccessible(true);

    setMobileDataEnabledMethod.invoke(iConnectivityManager, enabled);
}

回答1:

You cannot access mobile data on / off programmaticaly above android 4.4 .It have been made stopped for security reasons ,instead you can ask the user using a dialog to enable the mobile data and then if he enable you can do your task.

回答2:

You cannot programatically enable internet connectio, but you can check if internet connection is present or not, if it is not persent, then you can tell the user to enable the internet connection.

Below code does that.

protected void createNetErrorDialog() {

    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setMessage("You need internet connection for this app. Please turn on mobile network or Wi-Fi in Settings.")
        .setTitle("Unable to connect")
        .setCancelable(false)
        .setPositiveButton("Settings",
        new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
                Intent i = new Intent(Settings.ACTION_WIRELESS_SETTINGS);
                startActivity(i);
            }
        }
    )
    .setNegativeButton("Cancel",
        new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
                MyActivity.this.finish();
            }
        }
    );
    AlertDialog alert = builder.create();
    alert.show();
}