diff --git a/README.md b/README.md
index 572f1d6..e17d030 100644
--- a/README.md
+++ b/README.md
@@ -18,14 +18,14 @@ implementation 'io.github.iamr0s:AndroidAppProcess:<version>'
 
 ```java
 AppProcess process = new AppProcess.Default();
-process.init(context.getPackageName());
+process.init(context);
 ```
 
 - Root
 
 ```java
 AppProcess process = new AppProcess.Root();
-process.init(context.getPackageName());
+process.init(context);
 ```
 
 ### 2. Use it.
@@ -34,13 +34,13 @@ process.init(context.getPackageName());
 
 ```java
 AppProcess process = new AppProcess.Root();
-process.init(context.getPackageName());
+process.init(context);
 
-IPackageManager manager = android.os.ServiceManager.getService("package");
+IBinder manager = ServiceManager.getService("package");
 IBinder binderWrapper = process.binderWrapper(manager.asBinder());
 IPackageManager managerWrapper = IPackageManager.Stub.asInterface(binderWrapper);
 
-managerWrapper.uninstall(...) // will call it in root.
+managerWrapper.uninstall(...); // will call it in root.
 ```
 
 - More
diff --git a/app/build.gradle b/app/build.gradle
index 3e3b9bf..661883e 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -32,5 +32,6 @@ android {
 }
 
 dependencies {
+    compileOnly project(":hidden-api")
     implementation project(":app-process")
 }
diff --git a/app/src/main/java/com/rosan/app_process/demo/MainActivity.java b/app/src/main/java/com/rosan/app_process/demo/MainActivity.java
index 70a7782..a9ad7e4 100644
--- a/app/src/main/java/com/rosan/app_process/demo/MainActivity.java
+++ b/app/src/main/java/com/rosan/app_process/demo/MainActivity.java
@@ -1,13 +1,59 @@
 package com.rosan.app_process.demo;
 
 import android.app.Activity;
+import android.content.pm.IPackageManager;
 import android.os.Bundle;
+import android.os.IBinder;
+import android.os.RemoteException;
+import android.os.ServiceManager;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import com.rosan.app_process.AppProcess;
+
+import java.util.Arrays;
 
 public class MainActivity extends Activity {
 
+    private void makeText(String msg) {
+        runOnUiThread(() -> Toast.makeText(this, msg, Toast.LENGTH_SHORT).show());
+    }
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+
+        AppProcess process = new AppProcess.Default();
+        if (!process.init(this)) {
+            makeText("AppProcess: failed initialize.");
+            finishAndRemoveTask();
+            return;
+        }
+
+        IBinder manager = ServiceManager.getService("package");
+        IBinder binderWrapper;
+        try {
+            binderWrapper = process.binderWrapper(manager);
+        } catch (IllegalStateException ignored) {
+            makeText("AppProcess: please call init() first.");
+            finishAndRemoveTask();
+            return;
+        }
+        IPackageManager managerWrapper = IPackageManager.Stub.asInterface(binderWrapper);
+
+        String[] libraries = new String[]{"NULL"};
+        try {
+            if (managerWrapper != null) {
+                libraries = managerWrapper.getSystemSharedLibraryNames();
+            }
+        } catch (RemoteException ignored) {
+            makeText("RemoteException occurred.");
+        }
+
+        TextView text = findViewById(R.id.text);
+        text.setText(Arrays.toString(libraries));
+
+        process.close();
     }
 }
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index dca8204..8ddf7c5 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,12 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:gravity="center">
 
     <TextView
+        android:id="@+id/text"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="Hello World!" />
 
-</LinearLayout>
+</ScrollView>
diff --git a/hidden-api/build.gradle b/hidden-api/build.gradle
index e3b548a..af88231 100644
--- a/hidden-api/build.gradle
+++ b/hidden-api/build.gradle
@@ -10,6 +10,10 @@ android {
         minSdk = 19
     }
 
+    buildFeatures {
+        aidl = true
+    }
+
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_21
         targetCompatibility JavaVersion.VERSION_21
diff --git a/hidden-api/src/main/aidl/android/content/pm/IPackageManager.aidl b/hidden-api/src/main/aidl/android/content/pm/IPackageManager.aidl
new file mode 100644
index 0000000..8a0dab1
--- /dev/null
+++ b/hidden-api/src/main/aidl/android/content/pm/IPackageManager.aidl
@@ -0,0 +1,5 @@
+package android.content.pm;
+
+interface IPackageManager {
+    String[] getSystemSharedLibraryNames();
+}