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 that 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 the 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 the first click:

 

 

Output on 5th click:

 

 

Output on 6th click:

 

 

Output after 6th click and before Auto Destroy: