Development of Digital Counter - Taasbi Application

In this post, I am describing complete procedure for the Development of Digital Counter - Taasbi Application to be developed in the Android Studio.

Step 1: Open empty project on android studio.

Step 2: Open activity_main.xml and code as

<?xml version="1.0" encoding="utf-8"?><RelativeLayout 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">

    <TextView        android:id="@+id/counterTxt"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerHorizontal="true"        android:layout_marginTop="40dp"        android:textSize="120sp"        android:text="25"/>

    <LinearLayout        android:layout_below="@+id/counterTxt"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerHorizontal="true"        android:orientation="horizontal"        android:layout_marginTop="80dp">

        <Button            android:id="@+id/minusBtn"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="-"            android:textSize="50sp"/>

        <Button            android:id="@+id/resetBtn"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="Reset"            android:textSize="50sp"            android:layout_marginLeft="5dp"            android:layout_marginRight="5dp"/>

        <Button            android:id="@+id/plusBtn"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="+"            android:textSize="50sp"/>

    </LinearLayout>

</RelativeLayout>

Step 3: Open MainActivity.java and code as

package com.example.taasbi_digitalcounter;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private TextView counterTxt;
    private Button minusBtn;
    private Button plusBtn;
    private Button resetBtn;

    private  int counter;

    private View.OnClickListener clickListener = new View.OnClickListener() {
        @Override        public void onClick(View v) {
            switch (v.getId()){
                case R.id.minusBtn :
                    minusCounter();
                    break;
                case R.id.plusBtn :
                    plusCounter();
                    break;
                case R.id.resetBtn :
                    initCounter();
                    break;
            }
        }
    };
    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        counterTxt = (TextView) findViewById(R.id.counterTxt);
        minusBtn = (Button) findViewById(R.id.minusBtn);
        minusBtn.setOnClickListener(clickListener);
        plusBtn = (Button) findViewById(R.id.plusBtn);
        plusBtn.setOnClickListener(clickListener);
        resetBtn = (Button) findViewById(R.id.resetBtn);
        resetBtn.setOnClickListener(clickListener);

        initCounter();
    }

    private void initCounter(){
        counter = 0;
        counterTxt.setText(counter + "");
    }

    private void plusCounter(){
        counter++;
        counterTxt.setText(counter + "");
    }

    private void minusCounter(){
        counter--;
        counterTxt.setText(counter + "");
    }
}