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.
<?xml version=”1.0″ encoding=”utf-8″?>
<android.support.constraint.ConstraintLayout xmlns:android=”http://schemas.android.com/apk/res/android”
xmlns:app=”http://schemas.android.com/apk/res-auto”
xmlns:tools=”http://schemas.android.com/tools”
android:layout_width=”match_parent”
android:layout_height=”match_parent”
tools:context=”example.javatpoint.com.alertdialog.MainActivity”>
<Button
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:id=”@+id/button”
android:text=”Close app”
app:layout_constraintBottom_toBottomOf=”parent”
app:layout_constraintLeft_toLeftOf=”parent”
app:layout_constraintRight_toRightOf=”parent”
app:layout_constraintTop_toTopOf=”parent” />
</android.support.constraint.ConstraintLayout>
strings.xml
Optionally, you can store the dialog message and title in the strings.xml file.
Activity class
Let’s write the code to create and show the AlertDialog.
Output:
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