SmsHook/app/src/main/java/com/example/smshook/SmsHook.java

package com.example.smshook;

import android.app.Activity;
import android.app.Application;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.widget.Toast;

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

public class SmsHook {
    private Activity activity;
    private ClassLoader classLoader;
    private Handler handler;

    public void handleLoadPackage(XC_LoadPackage.LoadPackageParam lpparam) {
        try {
            Class<?> clazz = XposedHelpers.findClass("com.example.mysmsapp.MainActivity", lpparam.classLoader);
            XposedHelpers.findAndHookMethod(clazz, "onCreate", Bundle.class, new XC_MethodHook() {
                @Override
                protected void beforeHookedMethod(MethodHookParam param) {
                    Toast.makeText((Activity) param.thisObject, "hooked", Toast.LENGTH_LONG).show();
                    activity = (Activity) param.thisObject;
                    classLoader = activity.getClassLoader();
                    handler = new Handler(Looper.getMainLooper());


                }
            });
        } catch (Throwable e) {
            e.printStackTrace();
        }
    }
}