I want to change the preferred network mode ie. gsm or wcdma or auto, programmatically, from code, on Android.
Is this possible, and if so how ?
This is not an answer, but expanding on Tulio-F's answer.
The RILConstants.java contain the following:
// NETWORK_MODE_* See ril.h RIL_REQUEST_SET_PREFERRED_NETWORK_TYPE
int NETWORK_MODE_WCDMA_PREF = 0; // GSM/WCDMA (WCDMA preferred)
int NETWORK_MODE_GSM_ONLY = 1; // GSM only
int NETWORK_MODE_WCDMA_ONLY = 2; // WCDMA only
int NETWORK_MODE_GSM_UMTS = 3; // GSM/WCDMA (auto mode, according to PRL)**
int NETWORK_MODE_CDMA = 4; // CDMA and EvDo (auto mode, according to PRL)**
int NETWORK_MODE_CDMA_NO_EVDO = 5; // CDMA only
int NETWORK_MODE_EVDO_NO_CDMA = 6; // EvDo only
int NETWORK_MODE_GLOBAL = 7; // GSM/WCDMA, CDMA, and EvDo (auto mode, according to PRL)**
int NETWORK_MODE_LTE_CDMA_EVDO = 8; // LTE, CDMA and EvDo
int NETWORK_MODE_LTE_GSM_WCDMA = 9; // LTE, GSM/WCDMA
int NETWORK_MODE_LTE_CDMA_EVDO_GSM_WCDMA = 10; // LTE, CDMA, EvDo, GSM/WCDMA
int NETWORK_MODE_LTE_ONLY = 11; // LTE Only mode.
int NETWORK_MODE_LTE_WCDMA = 12; // LTE/WCDMA
int NETWORK_MODE_TDSCDMA_ONLY = 13; // TD-SCDMA only
int NETWORK_MODE_TDSCDMA_WCDMA = 14; // TD-SCDMA and WCDMA
int NETWORK_MODE_LTE_TDSCDMA = 15; // TD-SCDMA and LTE
int NETWORK_MODE_TDSCDMA_GSM = 16; // TD-SCDMA and GSM
int NETWORK_MODE_LTE_TDSCDMA_GSM = 17; // TD-SCDMA,GSM and LTE
int NETWORK_MODE_TDSCDMA_GSM_WCDMA = 18; // TD-SCDMA, GSM/WCDMA
int NETWORK_MODE_LTE_TDSCDMA_WCDMA = 19; // TD-SCDMA, WCDMA and LTE
int NETWORK_MODE_LTE_TDSCDMA_GSM_WCDMA = 20; // TD-SCDMA, GSM/WCDMA and LTE
int NETWORK_MODE_TDSCDMA_CDMA_EVDO_GSM_WCDMA = 21; // TD-SCDMA,EvDo,CDMA,GSM/WCDMA
int NETWORK_MODE_LTE_TDSCDMA_CDMA_EVDO_GSM_WCDMA = 22; // TD-SCDMA/LTE/GSM/WCDMA, CDMA, and EvDo
int PREFERRED_NETWORK_MODE = SystemProperties.getInt("ro.telephony.default_network", NETWORK_MODE_WCDMA_PREF);
Where:
** = "AVAILABLE Application Settings menu"
For this to work, your app must be signed with the system key or have carrier privilege. Otherwise the app will throw
java.lang.SecurityException: No modify permission or carrier privilege.
My app runs on Android 5.1 Lollipop(API 22) and is signed with the system key, so this is the only configuration I can confirm for sure that works. I can't confirm the carrier privilege approach.
Add this permission to your app manifest. If you are using Android Studio, it will probably mark this line as an error because only system apps can have this permission. If you can sign your app with the system keys, don't worry.
<uses-permission android:name="android.permission.MODIFY_PHONE_STATE"/>
The return is defined in RILConstants.java, e.g. RILConstants.NETWORK_MODE_WCDMA_PREF
public int getPreferredNetwork() {
Method method = getHiddenMethod("getPreferredNetworkType", TelephonyManager.class, null);
int preferredNetwork = -1000;
try {
preferredNetwork = (int) method.invoke(mTelephonyManager);
Log.i(TAG, "Preferred Network is ::: " + preferredNetwork);
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
return preferredNetwork;
}
The parameter must be based on RILConstants.java
, e.g.: RILConstants.NETWORK_MODE_LTE_ONLY
public void setPreferredNetwork(int networkType) {
try {
Method setPreferredNetwork = getHiddenMethod("setPreferredNetworkType",
TelephonyManager.class, new Class[] {int.class});
Boolean success = (Boolean)setPreferredNetwork.invoke(mTelephonyManager,
networkType);
Log.i(TAG, "Could set Network Type ::: " + (success.booleanValue() ? "YES" : "NO"));
} catch (InvocationTargetException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
}
This is an utility method to access the hidden API methods.
/**
* Get a hidden method instance from a class
* @param methodName The name of the method to be taken from the class
* @param fromClass The name of the class that has the method
* @return A Method instance that can be invoked
*/
public Method getHiddenMethod(String methodName, Class fromClass, Class[] params) {
Method method = null;
try {
Class clazz = Class.forName(fromClass.getName());
method = clazz.getMethod(methodName, params);
method.setAccessible(true);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
return method;
}
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