Develop Reference

Can I use private API in my application then upload to Google play market?

In my application, I used a snippet code below
public static void setMobileDataEnabled(Context context, boolean enabled) {
try {
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);
} catch (Exception e) {
e.printStackTrace();
}
Can anyone know when I used this code in my application, Google still allows me to upload my app, or will prevent/reject - because it is private API / forbidden API?

Yes, it is supported, and even recommended in the situation where you want compatibility with multiple versions of the Android OS in one apk file.
You can check the article from android official blog about reflection.
http://android-developers.blogspot.com.br/2009/04/backward-compatibility-for-android.html

How can i turn on MobileNetwork?

I tried to turn on MobileNetwork by using code below,but it does not work and it throws **NoSuchMethodexception **. How can I turn on MOBILE NETWORK without NoSuchMethodException?
public void setMobileDataEnabled(boolean enabled,Context ctx) {
try{
final ConnectivityManager cm = (ConnectivityManager) ctx.getSystemService(Context.CONNECTIVITY_SERVICE);
final Class conmanClass = Class.forName(cm.getClass().getName());
final Field connectivityManagerField = conmanClass.getDeclaredField("mService");
connectivityManagerField.setAccessible(true);
final Object connectivityManager = connectivityManagerField.get(cm);
final Class connectivityManagerClass = Class.forName(connectivityManager.getClass().getName());
final Method setMobileDataEnabledMethod = connectivityManagerClass.getDeclaredMethod("setMobileDataEnabled",Boolean.TYPE);
setMobileDataEnabledMethod.setAccessible(true);
setMobileDataEnabledMethod.invoke(connectivityManager, enabled);
}
catch(Exception e){
e.printStackTrace();
}}
And this is permission I Added.
"android.permission.CHANGE_NETWORK_STATE"

For accessing the WIFI state :
WifiManager wifiManager ;
wifiManager = (WifiManager)this.getSystemService(this.WIFI_SERVICE);
wifiManager.setWifiEnabled(true); //True - to enable WIFI connectivity .
For accessing the DATA/3G state :
ConnectivityManager dataManager;
dataManager = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
Method dataMtd = ConnectivityManager.class.getDeclaredMethod("setMobileDataEnabled", boolean.class);
dataMtd.setAccessible(true);
dataMtd.invoke(dataManager, true); //True - to enable data connectivity .
Now you need to add this permissions in Manifest file :
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>

Android L: Data turn off error

I've been using the following code on android 2.3 - 4.4.4 without any errors. But on running it on android L developer preview it gives me the following error
10-15 15:51:53.499: D/phone(30419): java.lang.NoSuchMethodException: setMobileDataEnabled [boolean]
try {
// log.i("Application running on Ginger bread+");
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, ON);
} catch (Exception e) {
Log.d(TELEPHONY_SERVICE, e.toString());
}
Is there any work round for this problem.
Any help is appreciated
Sahil

setMobileDataEnabled has been removed in Android L.
Use this instead:
TelephonyManager tm = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
Method methodSet = Class.forName(tm.getClass().getName()).getDeclaredMethod( "setDataEnabled", Boolean.TYPE);
methodSet.invoke(tm,true);
Make sure you have this permission on your manifest:
<uses-permission android:name="android.permission.MODIFY_PHONE_STATE"/>
This permission is for System apps only

Turn on/off mobile network connection programmatically in android jelly bean

I am using below code to turn on/off mobile network.
final ConnectivityManager conman = (ConnectivityManager) getApplicationContext().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, ON);
I tested this code with Android 2.3.X, 4.0.X and 4.1.X. It is working with only 2.3.X and 4.0.X but failed with 4.1.X.
I am getting java.lang.NoSuchFieldException: mService exception while testing with Android Jelly Bean.
Is there any other solution to my problem? I added all required permissions in manifest file.

try
{
dataMtd = ConnectivityManager.class.getDeclaredMethod("setMobileDataEnabled", boolean.class);
}
catch (SecurityException e1)
{
e1.printStackTrace();
}
catch (NoSuchMethodException e1)
{
e1.printStackTrace();
}
dataMtd.setAccessible(true);
try {
dataMtd.invoke(conm,true);
}
}
Where datamtd is a method.. Try with this my friend. I found it successful in my previous app. Hope this may help you. Sorry if not, since I'm not much experienced.:)

How to provide option to select wi-fi or GPRS for network connectivity in android app

In my app i want to provide the user with the option to choose wi-fi / GPRS for network connectivity to the web server. May be answers to the following ques solve my prob ...
1. How to check which is the current default network connectivity option enabled.
2. How to enable wi-fi/GPRS on user selection or (disable the wi-fi if user chooses GPRS - if only this option will be required for GPRS to work)
or is there some other way around to do this ?

Try this:
ConnectivityManager connManager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo mWifi = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
if (mWifi.isConnected())
//if wifi connected
}
ConnectivityManager connManager1 = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo mMobile = connManager1.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
if (mMobile.isConnected()) {
//if internet connected
}
Don't forget to add these permissions in the manifest file;
android.permission.CHANGE_WIFI_STATE
android.permission.ACCESS_WIFI_STATE
android.permission.UPDATE_DEVICE_STATS
android.permission.CHANGE_NETWORK_STATE
android.permission.ACCESS_NETWORK_STATE
android.permission.MODIFY_PHONE_STATE
android.permission.READ_PHONE_STATE
To enable or disable Wifi, use mWiFi.setWifiEnabled(true|false)
To enable/disable GPRS/3G, use the following code snippet.
void turnData(boolean ON) throws Exception
{
if(bv == Build.VERSION_CODES.FROYO)
{
Log.i("version:", "Found Froyo");
try{
Method dataConnSwitchmethod;
Class telephonyManagerClass;
Object ITelephonyStub;
Class ITelephonyClass;
TelephonyManager telephonyManager = (TelephonyManager) getApplicationContext().getSystemService(Context.TELEPHONY_SERVICE);
telephonyManagerClass = Class.forName(telephonyManager.getClass().getName());
Method getITelephonyMethod = telephonyManagerClass.getDeclaredMethod("getITelephony");
getITelephonyMethod.setAccessible(true);
ITelephonyStub = getITelephonyMethod.invoke(telephonyManager);
ITelephonyClass = Class.forName(ITelephonyStub.getClass().getName());
if (ON) {
dataConnSwitchmethod = ITelephonyClass.getDeclaredMethod("enableDataConnectivity");
} else {
dataConnSwitchmethod = ITelephonyClass.getDeclaredMethod("disableDataConnectivity");
}
dataConnSwitchmethod.setAccessible(true);
dataConnSwitchmethod.invoke(ITelephonyStub);
}catch(Exception e){
Log.e("Error:",e.toString());
}
}
else
{
Log.i("version:", "Found Gingerbread+");
final ConnectivityManager conman = (ConnectivityManager) getApplicationContext().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, ON);
}
}

You can provide option to user on screen using following code block....
public static ShowAvailable()
{
ConnectivityManager connectivityMgr = (ConnectivityManager)
getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo[] nwInfos = connectivityMgr.getAllNetworkInfo();
for (NetworkInfo nwInfo : nwInfos)
{
Log.d(TAG, "Network Type Name: " +
nwInfo.getTypeName()); Log.d(TAG, "Network available: " +
nwInfo.isAvailable()); Log.d(TAG, "Network c_or-c: " +
nwInfo.isConnectedOrConnecting()); Log.d(TAG, "Network connected: "
+ nwInfo.isConnected());
}
}

Continuing the #rIHaN JiTHiN answer, it should be noted that two permissions android.permission.UPDATE_DEVICE_STATS and android.permission.MODIFY_PHONE_STATE are only granted to system app (as it is initially set in Eclipse or Android Studio). So if someone will be faced with this issue, look at this solution.