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Proper use cases for Android UserManager.isUserAGoat()?
This example demonstrate about Proper use cases for Android UserManager.isUserAGoat()
Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.
Step 2 − Add the following code to res/layout/activity_main.xml.
<?xml version = "1.0" encoding = "utf-8"?> <LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" xmlns:app = "http://schemas.android.com/apk/res-auto" xmlns:tools = "http://schemas.android.com/tools" android:layout_width = "match_parent" android:gravity = "center" android:layout_height = "match_parent" tools:context = ".MainActivity" android:orientation = "vertical"> <TextView android:id = "@+id/actionEvent" android:textSize = "40sp" android:layout_marginTop = "30dp" android:layout_width = "wrap_content" android:layout_height = "match_parent" /> </LinearLayout>
In the above code, we have taken text view to show global variable.
Step 3 − Add the following code to src/MainActivity.java
<?xml version = "1.0" encoding = "utf-8"?>
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.RequiresApi;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
TextView actionEvent;
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
actionEvent = findViewById(R.id.actionEvent);
actionEvent.setText("Click");
actionEvent.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(isUserAGoat()) {
singleToneClass singleToneClass = com.example.myapplication.singleToneClass.getInstance();
singleToneClass.setData("Tutorialspoint.com");
actionEvent.setText(singleToneClass.getData());
}
}
});
}
public boolean isUserAGoat() {
PackageManager pm = getPackageManager();
boolean app_installed;
try {
pm.getPackageInfo("com.example.myapplication",PackageManager.GET_ACTIVITIES);
app_installed = true;
}
catch (PackageManager.NameNotFoundException e) {
app_installed = false;
}
return app_installed;
}
}Step 4 − Add the following code to src/singleToneClass.java
<?xml version = "1.0" encoding = "utf-8"?>
public class singleToneClass {
String s;
private static final singleToneClass ourInstance = new singleToneClass();
public static singleToneClass getInstance() {
return ourInstance;
}
private singleToneClass() {
}
public void setData(String s) {
this.s = s;
}
public String getData() {
return s;
}
}Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click Run 
icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen –
Now click on textview, it will show the result as shown below –
Click here to download the project code
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