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: