Hooking into any class in Google Play Services

XHookGms.java

package com.versobit.kmark.gist;

import android.app.Application;
import android.content.Context;

import de.robv.android.xposed.IXposedHookLoadPackage;
import de.robv.android.xposed.XC_MethodHook;
import de.robv.android.xposed.callbacks.XC_LoadPackage;

import static de.robv.android.xposed.XposedHelpers.findAndHookMethod;

public class XHookGms implements IXposedHookLoadPackage {
    @Override
    public void handleLoadPackage(final XC_LoadPackage.LoadPackageParam lpp) throws Throwable {
        if(!"com.google.android.gms".equals(lpp.packageName)) {
            return;
        }
        findAndHookMethod(Application.class, "attach", Context.class, new XC_MethodHook() {
            @Override
            protected void afterHookedMethod(MethodHookParam param) throws Throwable {
                // Hook here (as normal) using lpp.classLoader
            }
        });
    }
}