Introduction

Hey guys how are you? Today I will show you how to make an alert dialog box in Android. In this tutorial, I am using the class reference here Android. Builder. Let's start.
Figure 1
alertDialog in android
Figure 2
enter name in alertDialog in android
Figure 3
clear screen in android alertDialog
AndroidManifest.xml File
This is your AndroidManifest File; replace it with your own:
  1. <?xml version="1.0" encoding="utf-8"?>
  2. <manifest xmlns:android="http://schemas.android.com/apk/res/android"
  3. package="com.example.alertdialog"
  4. android:versionCode="1"
  5. android:versionName="1.0" >
  7. <uses-sdk
  8. android:minSdkVersion="8"
  9. android:targetSdkVersion="19" />
  11. <application
  12. android:allowBackup="true"
  13. android:icon="@drawable/ic_launcher"
  14. android:label="@string/app_name"
  15. android:theme="@style/AppTheme" >
  16. <activity
  17. android:name="com.example.alertdialog.MainActivity"
  18. android:label="@string/app_name" >
  19. <intent-filter>
  20. <action android:name="android.intent.action.MAIN" />
  22. <category android:name="android.intent.category.LAUNCHER" />
  23. </intent-filter>
  24. </activity>
  25. </application>
  27. </manifest>
Main.xml(Layout File)
This is your layout file:
  1. <?xml version="1.0" encoding="utf-8"?>
  2. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  3. android:layout_width="match_parent"
  4. android:layout_height="match_parent" >
  6. <EditText
  7. android:id="@+id/EditText01"
  8. android:text="I Love Android"
  9. android:layout_height="50dip"
  10. android:layout_width="180dip">
  12. </EditText>
  14. <Button
  15. android:id="@+id/Button01"
  16. android:layout_width="wrap_content"
  17. android:layout_height="wrap_content"
  18. android:layout_below="@+id/EditText01"
  19. android:text="Clear Screen">
  21. </Button>
  22. </RelativeLayout>
MainActivity.java File
This is your main Java file in which you will code it:
package com.example.alertdialog;
  1. package com.example.alertdialog;
  3. import android.support.v7.app.ActionBarActivity;
  4. import android.support.v7.app.ActionBar;
  5. import android.support.v4.app.Fragment;
  6. import android.app.AlertDialog;
  7. import android.app.Dialog;
  8. import android.content.DialogInterface;
  9. import android.os.Bundle;
  10. import android.view.LayoutInflater;
  11. import android.view.Menu;
  12. import android.view.MenuItem;
  13. import android.view.View;
  14. import android.view.ViewGroup;
  15. import android.widget.Button;
  16. import android.widget.EditText;
  17. import android.widget.Toast;
  18. import android.os.Build;
  20. public class MainActivity extends ActionBarActivity
  21. {
  22. Button Clear;
  23. EditText edit_data;
  24. //Called when the activity is first created
  25. @Override
  26. public void onCreate(Bundle savedInstanceState)
  27. {
  28. super.onCreate(savedInstanceState);
  29. setContentView(R.layout.main);
  31. Clear=(Button)findViewById(R.id.Button01);
  32. edit_data=(EditText)findViewById(R.id.EditText01);
  34. Clear.setOnClickListener(new View.OnClickListener()
  35. {
  37. @Override
  38. public void onClick(View v)
  39. {
  41. AlertDialog.Builder builder=new AlertDialog.Builder(v.getContext());
  42. //Set a title
  43. builder.setTitle("Confirm");
  44. //Set a message
  45. builder.setMessage("Do you want to Clear?");
  46. ////Here Set a listener to be called when the positive button of the dialog is pressed.
  47. builder.setPositiveButton("OK",new DialogInterface.OnClickListener()
  48. {
  50. @Override
  51. public void onClick(DialogInterface dialog, int which)
  52. {
  54. //clearing the contents of edittext on click of OK button
  55. edit_data.setText("");
  56. //Displaying a toast message
  57. Toast.makeText(getApplicationContext(), "Your text has been cleared", Toast.LENGTH_LONG).show();
  58. }
  60. });
  61. //Here Set a listener to be called when the negative button of the dialog is pressed.
  62. builder.setNegativeButton("Cancel",new DialogInterface.OnClickListener()
  63. {
  65. @Override
  66. public void onClick(DialogInterface dialog, int which)
  67. {
  68. // TODO Auto-generated method stub
  69. dialog.cancel();
  70. }
  71. });
  73. //Create the dialog
  74. AlertDialog alertdialog=builder.create();
  76. //show the alertdialog
  77. alertdialog.show();
  79. }
  80. });
  81. }
  83. }

Summary

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