ava Validation Programming Android [User Name] User can input value (a~z) (A~Z). User cannot input value number between 0 and 9. Show an error if user input it. User cannot input value contains symbol (ex: !@#$). Show an error if user input it. User must fill the form to proceed, Show an error if fill form is empty. User only able to input value less than 30 characters. Show an error if exceed. With the validation described above. By using xml layout below, use Android Studio and the Java programming language to solve this question. How to solve this in MainActivity.java? =============================== activity_main.xml =============================== MainActivity.java package mobile.test.testvalidationname; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); EditText editText_username = findViewById(R.id.editText_username); Button button_confirm= findViewById(R.id.button_confirm); button_confirm.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { } }); } }
Java Validation
[User Name]
- User can input value (a~z) (A~Z).
- User cannot input value number between 0 and 9. Show an error if user input it.
- User cannot input value contains symbol (ex: !@#$). Show an error if user input it.
- User must fill the form to proceed, Show an error if fill form is empty.
- User only able to input value less than 30 characters. Show an error if exceed.
- With the validation described above.
- By using xml layout below, use Android Studio and the Java programming language to solve this question.
How to solve this in MainActivity.java?
===============================
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
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"
tools:context=".MainActivity"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<EditText
android:id="@+id/editText_username"
android:layout_marginTop="150dp"
android:layout_width="300dp"
android:layout_height="wrap_content"
android:hint="User Name"
android:textAlignment="center"
android:layout_gravity="center"
android:text="" />
<Button
android:id="@+id/button_confirm"
android:layout_marginTop="100dp"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:textAlignment="center"
android:layout_gravity="center"
android:text="Confirm" />
</LinearLayout>
===============================
MainActivity.java
package mobile.test.testvalidationname;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
EditText editText_username = findViewById(R.id.editText_username);
Button button_confirm= findViewById(R.id.button_confirm);
button_confirm.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
}
}
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