Android AlertDialog Example

by Online Tutorials Library July 14, 2022

Android AlertDialog Example

Android AlertDialog can be used to display the dialog message with OK and Cancel buttons. It can be used to interrupt and ask the user about his/her choice to continue or discontinue.

Android AlertDialog is composed of three regions: title, content area and action buttons.

Android AlertDialog is the subclass of Dialog class.

Methods of AlertDialog class

Method	Description
public AlertDialog.Builder setTitle(CharSequence)	This method is used to set the title of AlertDialog.
public AlertDialog.Builder setMessage(CharSequence)	This method is used to set the message for AlertDialog.
public AlertDialog.Builder setIcon(int)	This method is used to set the icon over AlertDialog.

Android AlertDialog Example

Let’s see a simple example of android alert dialog.

activity_main.xml

You can have multiple components, here we are having only a textview.

File: activity_main.xml

       <button android:id="@+id/button" android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="Close app" app:layout_constraintbottom_tobottomof="parent" app:layout_constraintleft_toleftof="parent" app:layout_constraintright_torightof="parent" app:layout_constrainttop_totopof="parent"></button>   

strings.xml

Optionally, you can store the dialog message and title in the strings.xml file.

File: strings.xml

Activity class

Let’s write the code to create and show the AlertDialog.

File: MainActivity.java

 package example.tutoraspire.com.alertdialog;  import android.content.DialogInterface; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.app.AlertDialog; import android.widget.Toast;  public class MainActivity extends AppCompatActivity {     Button closeButton;     AlertDialog.Builder builder;     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          closeButton = (Button) findViewById(R.id.button);         builder = new AlertDialog.Builder(this);         closeButton.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                  //Uncomment the below code to Set the message and title from the strings.xml file                 builder.setMessage(R.string.dialog_message) .setTitle(R.string.dialog_title);                  //Setting message manually and performing action on button click                 builder.setMessage(“Do you want to close this application ?”)                         .setCancelable(false)                         .setPositiveButton(“Yes”, new DialogInterface.OnClickListener() {                             public void onClick(DialogInterface dialog, int id) {                                 finish();                                 Toast.makeText(getApplicationContext(),”you choose yes action for alertbox”,                                 Toast.LENGTH_SHORT).show();                             }                         })                         .setNegativeButton(“No”, new DialogInterface.OnClickListener() {                             public void onClick(DialogInterface dialog, int id) {                                 //  Action for ‘NO’ Button                                 dialog.cancel();                                 Toast.makeText(getApplicationContext(),”you choose no action for alertbox”,                                 Toast.LENGTH_SHORT).show();                             }                         });                 //Creating dialog box                 AlertDialog alert = builder.create();                 //Setting the title manually                 alert.setTitle(“AlertDialogExample”);                 alert.show();             }         });     } } 

Output:

Next TopicSpinner Example

Android AlertDialog Example

Android AlertDialog Example

Methods of AlertDialog class

Android AlertDialog Example

activity_main.xml

strings.xml

Activity class

Output:

Android 11 | Android Version 11

AndroidManifest.xml file in android

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