Tutorial how to generate random number between 0 and 99 in Android Studio 3.3.1.
Create new project with minimum SDK:
API 15 –
Android 4.0.3 (IceCreamSandwich).
In app->res->layout->
activity_main.xml write the code:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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:layout_height="match_parent"
tools:context=".MainActivity">
<Button
android:id="@+id/generate"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Generate random number"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintVertical_bias="0.0"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/generatenumber"
android:layout_width="wrap_content"
android:layout_height="200dp"
android:maxLines="1"
app:autoSizeTextType="uniform"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
In app->java->
MainActivity.java write the code:
package com.example.myapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.util.Random;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Random myRandom = new Random();
Button buttonGenerate = (Button)findViewById(R.id.generate);
final TextView textGenerateNumber = (TextView)findViewById(R.id.generatenumber);
buttonGenerate.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
textGenerateNumber.setText(String.valueOf(myRandom.nextInt(100)));
}
});
}
}
Run app in mobile device or
Emulator (
API 15 – Android 4.0.3 ) and see how it works.
Follow video
tutorial :
VIDEO
Download this
app for free and install it on your mobile device to see how it works:
https://android-coffee.com/wp-content/uploads/projecs/Random-Number-Generator.apk
Download project with
Source Code from here:
https://android-coffee.com/wp-content/uploads/projecs/Random-Number-Generator.7z
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