Android alertDialog is used in cases like asking for confirmation / making a decision when the user submits a form in android application or when the user want to delete something in the application.It’s just a confirmation from the user to proceed further.In this tutorial we will discuss how to display alertDialog in android studio with example.
Android AlertDialog
Android alertDialog is a small pop up window used to prompt some information to the user.Its nothing but a confirmation alert where the user approves or cancels the action.AlertDialog is a subclass of Dialog where we can display upto 3 buttons depending on the event.
AlertDialog mainly contains three components the title, content and action buttons.
Declaring an alertDialog
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
AlertDialog preview
Check this android UI controls tutorial to know about UI controls in android.
Android AlertDialog Methods
Android alertDialog offers some methods to customize the dialog lets see them.
- setTitle(): This method is used to set title to the alertDialog(optional)
- setIcon(): This method is used to set icon to alertDialog which appears before the title.The icon is a drawable file.
- setMessage(): This method is used to set the message we want to display to the user in the alertDialog.
- setCancellable(): This method is used to set whether the user can cancel the alertDialog by clicking outside the dialog anywhere on the screen by setting true/false.
- setPositiveButton(): This method is used to set a positive button for alertDialog.A click event can be implemented for this button.
- setNegetiveButton(): This method is used to set a negative button for alertDialog.A click event can be implemented for this button.
- setNeutralButton(): This method is used to set a neutral button for alertDialog.A click event can be implemented for this button.
Android AlertDialog Example With Single Button
The following code will create an alertDialog with single button
package com.codesinsider;
import android.content.DialogInterface;
import android.os.Bundle;
import android.widget.Toast;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
alertDialogBuilder.setTitle("Alert!!");
alertDialogBuilder.setMessage("AlertDialog with single button");
alertDialogBuilder.setPositiveButton("OK", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialogInterface, int i) {
Toast.makeText(MainActivity.this, "You clicked ok", Toast.LENGTH_SHORT).show();
}
});
alertDialogBuilder.show();
}
}
Output:
Android AlertDialog Example With Two Buttons
The following code will display an alertDialog with two buttons.
package com.codesinsider;
import android.content.DialogInterface;
import android.os.Bundle;
import android.widget.Toast;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
alertDialogBuilder.setTitle("Alert!!");
alertDialogBuilder.setMessage("AlertDialog with two buttons");
alertDialogBuilder.setPositiveButton("YES", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialogInterface, int i) {
Toast.makeText(MainActivity.this, "You clicked yes", Toast.LENGTH_SHORT).show();
}
});
alertDialogBuilder.setNegativeButton("NO", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
Toast.makeText(MainActivity.this, "You clicked no", Toast.LENGTH_SHORT).show();
}
});
alertDialogBuilder.show();
}
}
Output:
Android AlertDialog Example With Three Buttons
The following code creates an alertDialog with three buttons.
package com.codesinsider;
import android.content.DialogInterface;
import android.os.Bundle;
import android.widget.Toast;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
alertDialogBuilder.setTitle("Alert!!");
alertDialogBuilder.setMessage("AlertDialog with three buttons");
alertDialogBuilder.setPositiveButton("YES", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialogInterface, int i) {
Toast.makeText(MainActivity.this, "You clicked yes", Toast.LENGTH_SHORT).show();
}
});
alertDialogBuilder.setNegativeButton("NO", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
Toast.makeText(MainActivity.this, "You clicked no", Toast.LENGTH_SHORT).show();
}
});
alertDialogBuilder.setNeutralButton("CANCEL", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
Toast.makeText(MainActivity.this, "You clicked cancel", Toast.LENGTH_SHORT).show();
}
});
alertDialogBuilder.show();
}
}
Output:
That’s all about android alertDialog example in detail with all the components and methods with example.Lets see other android concepts in next tutorials.
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Reference: Android official documentation
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