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".
ButtonAction.jpg
Step 2
In this step we will open "activity_main.xml" and update it as in the following:
  1. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  2. xmlns:tools="http://schemas.android.com/tools"
  3. android:layout_width="match_parent"
  4. android:layout_height="match_parent"
  5. tools:context=".MainActivity" >
  6. <Button
  7. android:id="@+id/button1"
  8. android:layout_width="wrap_content"
  9. android:layout_height="wrap_content"
  10. android:layout_alignParentTop="true"
  11. android:layout_centerHorizontal="true"
  12. android:layout_marginTop="16dp"
  13. android:text="@string/click_btn" />
  14. <TextView
  15. android:id="@+id/textView1"
  16. android:layout_width="wrap_content"
  17. android:layout_height="wrap_content"
  18. android:layout_alignParentBottom="true"
  19. android:layout_alignParentLeft="true"
  20. android:layout_alignParentRight="true"
  21. android:layout_below="@+id/button1"
  22. android:text="@string/txt_view"
  23. android:textAppearance="?android:attr/textAppearanceMedium" />
  24. </RelativeLayout>
Step 3
In this step I will open "string.xml" and update it as in the following:
  1. <?xml version="1.0" encoding="utf-8"?>
  2. <resources>
  3. <string name="app_name">ButtonAction</string>
  4. <string name="hello_world">Hello world!</string>
  5. <string name="menu_settings">Settings</string>
  6. <string name="click_btn">Click Here</string>
  7. <string name="txt_view"></string>
  8. </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:
  1. package com.example.buttonaction;
  2. import android.app.Activity;
  3. import android.os.Bundle;
  4. import android.view.Menu;
  5. import android.view.View;
  6. import android.view.View.OnClickListener;
  7. import android.widget.Button;
  8. import android.widget.TextView;
  9. public class MainActivity extends Activity {
  10. int flage=1;
  11. Button btn;
  12. TextView tv;
  13. int i=1;
  14. @Override
  15. protected void onCreate(Bundle savedInstanceState) {
  16. super.onCreate(savedInstanceState);
  17. setContentView(R.layout.activity_main);
  18. btn=(Button) findViewById(R.id.button1);
  19. tv=(TextView) findViewById(R.id.textView1);
  20. btn.setOnClickListener(new OnClickListener() {
  21. @Override
  22. public void onClick(View v) {
  23. // TODO Auto-generated method stub
  24. if(flage==1)
  25. {
  26. switch(i)
  27. {
  28. case 1:
  29. tv.setText(i+" You Clicked Successfully ");
  30. break;
  31. case 2:
  32. tv.setText(i+" You Clicked Successfully ");
  33. break;
  34. case 3:
  35. tv.setText(i+" You Clicked Successfully ");
  36. break;
  37. case 4:
  38. tv.setText(i+" You Clicked Successfully ");
  39. break;
  40. case 5:
  41. tv.setText(i+" You Clicked Successfully ");
  42. break;
  43. case 6:
  44. tv.setText(i+" You Clicked Successfully,\n Now you are going to finish this app. ");
  45. break;
  46. default:
  47. }
  49. flage=0;
  50. i++;
  51. }
  52. else if(flage==0)
  53. {
  54. tv.setText(" ");
  55. if(i>6)
  56. {
  57. finish();
  58. }
  59. flage=1;
  60. }
  61. }
  62. });
  63. }
  65. @Override
  66. public boolean onCreateOptionsMenu(Menu menu) {
  67. // Inflate the menu; this adds items to the action bar if it is present.
  68. getMenuInflater().inflate(R.menu.activity_main, menu);
  69. return true;
  70. }
  71. }
Step 5
And if we need an update in "Manifest.xml" I will also update it as in the following code.
  1. <?xml version="1.0" encoding="utf-8"?>
  2. <manifest xmlns:android="http://schemas.android.com/apk/res/android"
  3. package="com.example.buttonaction"
  4. android:versionCode="1"
  5. android:versionName="1.0" >
  6. <uses-sdk
  7. android:minSdkVersion="8"
  8. android:targetSdkVersion="17" />
  9. <application
  10. android:allowBackup="true"
  11. android:icon="@drawable/ic_launcher"
  12. android:label="@string/app_name"
  13. android:theme="@style/AppTheme" >
  14. <activity
  15. android:name="com.example.buttonaction.MainActivity"
  16. android:label="@string/app_name" >
  17. <intent-filter>
  18. <action android:name="android.intent.action.MAIN" />
  19. <category android:name="android.intent.category.LAUNCHER" />
  20. </intent-filter>
  21. </activity>
  22. </application>
  24. </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:
ButtonActionOuput1.jpg
Output on 5th click:
ButtonActionOuput2.jpg
Output on 6th click:
ButtonActionOuput3.jpg
Output after 6th click and before Auto Destroy:
ButtonActionOuput4.jpg