Android Studio : AlertDialog and EditText to get user string input example
This is a supplementary tutorial for the previous tutorial on how to get user attention with AlertDialog. In this tutorial, we will learn how to add an EditText
string box to get the user input and display the entry on the main activity layout, such as shown below:
The following is a modification of previous tutorial activity_main_alert_dialog.xml
file. Basically, we just add the EditText
string input box to prompt the user to enter his/her username.
First, navigate the project structure in Android Studio and open up res/values/strings.xml
file.
Add <string name="username">Enter your user name here.</string>
in the file. We will use the new string
as a hint.
strings.xml
<resources>
<string name="app_name">AlertDialog</string>
<string name="username">Enter your user name here.</string>
</resources>
Next, let's move to res/layout
and create a new layout. Right click layout
and navigate to Layout Resource File
such as shown in the image below:
In the new layout, let's name it dialog_prompt_user.xml
, add the following XML codes and save.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:padding="20dp"
android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:id="@+id/username"
android:inputType="textEmailAddress"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:layout_marginLeft="4dp"
android:layout_marginRight="4dp"
android:layout_marginBottom="4dp"
android:hint="@string/username" />
</LinearLayout>
and finally, modify the /rest/values/layout/activity_main_alert_dialog.xml
file, by a adding a new 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="com.example.sweetlogic.alertdialog.MainAlertDialog"
tools:layout_editor_absoluteX="0dp"
tools:layout_editor_absoluteY="81dp">
<Button
android:id="@+id/buttonPromptUser"
android:layout_width="300dp"
android:layout_height="50dp"
android:text="Prompt User For Input"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:layout_editor_absoluteX="42dp"
tools:layout_editor_absoluteY="230dp" />
<TextView
android:id="@+id/TextAnswer"
android:layout_width="300dp"
android:layout_height="wrap_content"
android:text="Your username will be displayed here..."
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.321" />
</android.support.constraint.ConstraintLayout>
Ok, now we are done with the design phase. It is time to link all these widgets and UI elements together with Java. Head over to MainAlertDialog.java
file and fill it up with these codes:
package com.example.sweetlogic.alertdialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainAlertDialog extends AppCompatActivity {
final Context context = this;
private Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_alert_dialog);
addListenerOnButton();
}
public void addListenerOnButton() {
Button button = (Button) findViewById(R.id.buttonPromptUser);
final TextView usernameText = (TextView) findViewById(R.id.TextAnswer);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// load the dialog_promt_user.xml layout and inflate to view
LayoutInflater layoutinflater = LayoutInflater.from(context);
View promptUserView = layoutinflater.inflate(R.layout.dialog_prompt_user, null);
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(context);
alertDialogBuilder.setView(promptUserView);
final EditText userAnswer = (EditText) promptUserView.findViewById(R.id.usernameInput);
alertDialogBuilder.setTitle("What's your username?");
// prompt for username
alertDialogBuilder.setPositiveButton("Ok",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// and display the username on main activity layout
usernameText.setText(userAnswer.getText());
}
});
// all set and time to build and show up!
AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();
}
});
}
}
If everything goes well, you should see the app running after hitting the Run
button.
References:
https://socketloop.com/tutorials/android-studio-checkbox-for-user-to-select-options-example
See also : Android Studio : Checkbox for user to select options example
By Adam Ng
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