Work With Button Click In Android

Introduction

In this article I describe how to work a button in Android when it is clicked or pressed. In this article I develop an action which can be performed by a button, as you will see in the output of my application.

Here first of all we must create a new Android application project in Android. Then we will use my instructions provided here.

Step 1

In this step create a new application as shown below  using "File" -> "New" -> "Android Application Project".

Step 2

In this step we will open "activity_main.xml" and update it as in the following:

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

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context=".MainActivity" >

    <Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentTop="true"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="16dp"

        android:text="@string/click_btn" />

    <TextView

        android:id="@+id/textView1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentBottom="true"

        android:layout_alignParentLeft="true"

        android:layout_alignParentRight="true"

        android:layout_below="@+id/button1"

        android:text="@string/txt_view"

        android:textAppearance="?android:attr/textAppearanceMedium" />

</RelativeLayout>

Step 3

In this step I will open "string.xml" and update it as in the following:

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

<resources>

    <string name="app_name">ButtonAction</string>

    <string name="hello_world">Hello world!</string>

    <string name="menu_settings">Settings</string>

    <string name="click_btn">Click Here</string>

    <string name="txt_view"></string>

</resources>

Step 4

In this step i will open my "MainActivity.java"  file from my project and I will update it with my logic as in the following:

package com.example.buttonaction;

import android.app.Activity;

import android.os.Bundle;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;

public class MainActivity extends Activity {

      int flage=1;

      Button btn;

      TextView tv;

      int i=1;

      @Override

      protected void onCreate(Bundle savedInstanceState) {

            super.onCreate(savedInstanceState);

            setContentView(R.layout.activity_main);

            btn=(Button) findViewById(R.id.button1);

            tv=(TextView) findViewById(R.id.textView1);

            btn.setOnClickListener(new OnClickListener() {

                  @Override

                  public void onClick(View v) {

                        // TODO Auto-generated method stub

                        if(flage==1)

                        {                      

                              switch(i)

                              {

                              case 1:

                                    tv.setText(i+" You Clicked Successfully ");

                                    break;

                              case 2:

                                    tv.setText(i+" You Clicked Successfully ");

                                    break;

                              case 3:

                                    tv.setText(i+" You Clicked Successfully ");

                                    break;

                              case 4:

                                    tv.setText(i+" You Clicked Successfully ");

                                    break;

                              case 5:

                                    tv.setText(i+" You Clicked Successfully ");

                                    break;

                              case 6:

                                    tv.setText(i+" You Clicked Successfully,\n Now you are going to finish this app. ");

                                    break;

                                    default:

                              }

                       

                        flage=0;

                        i++;

                        }

                        else if(flage==0)

                        {

                              tv.setText(" ");

                              if(i>6)

                              {

                                    finish();

                              }

                              flage=1;

                        }

                  }

            });              

      }

 

      @Override

      public boolean onCreateOptionsMenu(Menu menu) {

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

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

            return true;

      }

}

Step 5

And if we need an update in "Manifest.xml" I will also update it as in the following code.

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

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

    package="com.example.buttonaction"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="17" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name="com.example.buttonaction.MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

 

</manifest>

Output

In the output you will see on the first 5-6 clicks that this button will work and after 6 clicks it will self-destroy, because here I use the finish() method.

You can see the Output below.

Output on first click:

Output on 5th click:

 

Output on 6th click:

Output after 6th click and before Auto Destroy: