Use Android hidden and internal methods

Its possible to use android hidden and internal methods by using the device android.jar instead the ADT's
It will work because the device have a version of android.jar (framework.zip) that have access to this methods.

Steps are (version 4.4.4):

1. copy: C:\Program Files\Android\android-sdk\platforms\android-19 to C:\Program Files\Android\android-sdk\platforms\android-19-internals

2. Download open android.jar and replace the android.jar in the android-19-internals folder. I created this jar from nexus 5 device framework.zip with 4.4.4 OS using a utility that converts dex file to regular classes.

3. Edit build.prop, change ro.build.version.sdk=19 to ro.build.version.sdk=-19 and ro.build.version.release=4.4 to ro.build.version.release=4.4.extended

4. restart eclipse, you will now see the 4.4.extended which you can select for your projects.


* Note that its highly recommended to verify the hidden/internal methods exists before you make such a call, you can do a simple verification using reflaction, here is an example:

 private boolean isRequestPestitentInfoMethodExists() {
        java.lang.reflect.Method method;
        try {
            Class cls = Class.forName("android.net.wifi.p2p.WifiP2pManager");
            method = cls.getMethod("requestPersistentGroupInfo",  Class.forName("android.net.wifi.p2p.WifiP2pManager$Channel"), Class.forName("android.net.wifi.p2p.WifiP2pManager$PersistentGroupInfoListener"));
            Log.i(P.TAG, "isRequestPestitentInfo Method Exists");
            return true;
        } catch (ClassNotFoundException e) {
            Log.e(P.TAG, "ClassNotFoundException: " + e.getMessage());
            return false;
        } catch (NoSuchMethodException e) {
            Log.e(P.TAG, "NoSuchMethodException: " + e.getMessage());
            return false;
        }

    }