Touch Counter Android App

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                 XML CODE

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    >

<TextView

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:text="Total is : 0"

    android:textSize="45dp"

    android:layout_gravity="center"

    android:gravity="center"

     android:id="@+id/tvDisplay"

    />

<Button

    android:layout_width="250dp"

    android:layout_height="wrap_content"

    android:id="@+id/bAdd"

    android:text="Add"

    android:layout_gravity="center"

    android:textSize="20dp"

    android:onClick="perfrom"

    />

<Button

    android:layout_width="250dp"

    android:layout_height="wrap_content"

    android:id="@+id/bSub"

    android:layout_gravity="center"

    android:text="Sub"

    android:textSize="20dp"

    android:onClick="perfrom"

    />

</LinearLayout>

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              JAVA CODE

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package com.example.newapp;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

public class MainActivity extends Activity {

  

       int counter;

       Button add ,sub;

       TextView display;

       @Override

       protected void onCreate(Bundle savedInstanceState) {

              super.onCreate(savedInstanceState);

              setContentView(R.layout.activity_main);

              counter=0;

              add = (Button) findViewById(R.id.bAdd);

              sub = (Button) findViewById(R.id.bSub);

              display = (TextView) findViewById(R.id.tvDisplay);

             

              add.setOnClickListener(new View.OnClickListener() {

                    

                     @Override

                     public void onClick(View v) {

                           // TODO Auto-generated method stub

                           counter++;

                           display.setText("Total : "+counter);

                     }

              });

             

        sub.setOnClickListener(new View.OnClickListener() {

                    

                     @Override

                     public void onClick(View v) {

                           // TODO Auto-generated method stub

                           counter--;

                           display.setText("Total : "+counter);

                     }

              });

       }

       @Override

       public boolean onCreateOptionsMenu(Menu menu) {

              // Inflate the menu; this adds items to the action bar if it is present.

              getMenuInflater().inflate(R.menu.main, menu);

              return true;

       }

}

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OUTPUT

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