I trying to change NFC settings (on/off) programmatically on Android 2.3.3.
On the phone, under the "Wireless & network settings",
you can choose to set whether you want to use NFC to read and exchange tags or not.
So I would like to toggle this setting in my application.
But I can't seem to find an api for this.
I'm looking for some code that would probably look like this:
WifiManager wifi = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
wifi.setWifiEnabled( on/off );
It's not possible programatically without rooting device.
But you can start NFC Settings Activity by intent action Settings.ACTION_NFC_SETTINGS for api level 16 and above. For api < 16 use Settings.ACTION_WIRELESS_SETTINGS
Previous selected answer suggests to use WIFI_SETTINGS but we can directly move to NFC_SETTINGS
Here's the example :
android.nfc.NfcAdapter mNfcAdapter= android.nfc.NfcAdapter.getDefaultAdapter(v.getContext());
if (!mNfcAdapter.isEnabled()) {
AlertDialog.Builder alertbox = new AlertDialog.Builder(v.getContext());
alertbox.setTitle("Info");
alertbox.setMessage(getString(R.string.msg_nfcon));
alertbox.setPositiveButton("Turn On", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
Intent intent = new Intent(Settings.ACTION_NFC_SETTINGS);
startActivity(intent);
} else {
Intent intent = new Intent(Settings.ACTION_WIRELESS_SETTINGS);
startActivity(intent);
}
}
});
alertbox.setNegativeButton("Close", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
alertbox.show();
}
You can not turn it on/off manually but you can send the user to the preferences if it is off:
if (!nfcForegroundUtil.getNfc().isEnabled())
{
Toast.makeText(getApplicationContext(), "Please activate NFC and press Back to return to the application!", Toast.LENGTH_LONG).show();
startActivity(new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS));
}
Method getNfc() just returns the nfcadapter:
nfc = NfcAdapter.getDefaultAdapter(activity.getApplicationContext());
if you want to do it programmatically, apperently this Q holds the answer:
How can I enable NFC reader via API?
Edit
it didn't hold the answer, but it held the key to the answer, on which I based my code I answered with in the Q.
I will paste it here as well in case anyone's interested.
I got it working through reflection
This code works on API 15, haven't checked it against other verions yet
public boolean changeNfcEnabled(Context context, boolean enabled) {
// Turn NFC on/off
final boolean desiredState = enabled;
mNfcAdapter = NfcAdapter.getDefaultAdapter(context);
if (mNfcAdapter == null) {
// NFC is not supported
return false;
}
new Thread("toggleNFC") {
public void run() {
Log.d(TAG, "Setting NFC enabled state to: " + desiredState);
boolean success = false;
Class<?> NfcManagerClass;
Method setNfcEnabled, setNfcDisabled;
boolean Nfc;
if (desiredState) {
try {
NfcManagerClass = Class.forName(mNfcAdapter.getClass().getName());
setNfcEnabled = NfcManagerClass.getDeclaredMethod("enable");
setNfcEnabled.setAccessible(true);
Nfc = (Boolean) setNfcEnabled.invoke(mNfcAdapter);
success = Nfc;
} catch (ClassNotFoundException e) {
} catch (NoSuchMethodException e) {
} catch (IllegalArgumentException e) {
} catch (IllegalAccessException e) {
} catch (InvocationTargetException e) {
}
} else {
try {
NfcManagerClass = Class.forName(mNfcAdapter.getClass().getName());
setNfcDisabled = NfcManagerClass.getDeclaredMethod("disable");
setNfcDisabled.setAccessible(true);
Nfc = (Boolean) setNfcDisabled.invoke(mNfcAdapter);
success = Nfc;
} catch (ClassNotFoundException e) {
} catch (NoSuchMethodException e) {
} catch (IllegalArgumentException e) {
} catch (IllegalAccessException e) {
} catch (InvocationTargetException e) {
}
}
if (success) {
Log.d(TAG, "Successfully changed NFC enabled state to "+ desiredState);
} else {
Log.w(TAG, "Error setting NFC enabled state to "+ desiredState);
}
}
}.start();
return false;
}//end method
This requires 2 permissions though, put them in the manifest:
<!-- change NFC status toggle -->
<uses-permission android:name="android.permission.NFC" />
<uses-permission android:name="android.permission.WRITE_SECURE_SETTINGS" />
The NFC button's state switches accordingly when the code is used, so there are no issues when doing it manually in the seetings menu.
To clarify: This code doesn't work on normal devices. There are ways around, but at least it requires root.
Please check this below URL everything is given as step by step.
http://ranjithdroid.blogspot.com/2015/11/turn-onoff-android-nfc-by.html
You can control the NFC transfers and stuff. But for now turning it on and off is not possible :(
