MainActivity.java
package com.cfsuman.androidtutorials;
import android.os.Bundle;
import android.app.Activity;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Get the widgets reference from XML layout
Button button = findViewById(R.id.button);
ListView listView = findViewById(R.id.listView);
// Initializing a new String Array
String[] fruits = new String[] {
"Black Walnut",
"Blackberry",
"Blue tongue",
"Bolwarra",
"Bottle Gourd"
};
// Create a List from String Array elements
final List<String> fruits_list = new ArrayList<String>
(Arrays.asList(fruits));
// Create an ArrayAdapter from List
final ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>
(
this,
android.R.layout.simple_list_item_1,
fruits_list
);
// DataBind ListView with items from ArrayAdapter
listView.setAdapter(arrayAdapter);
button.setOnClickListener(view -> {
// Remove / Delete all items from List
// Clear ListView Items
fruits_list.clear();
/*
notifyDataSetChanged ()
Notifies the attached observers that the underlying
data has been changed and any View reflecting the
data set should refresh itself.
*/
arrayAdapter.notifyDataSetChanged();
// Disable the button itself
view.setEnabled(false);
});
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#DCDCDC"
android:padding="24dp">
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Remove All Items From ListView"
android:textAllCaps="false"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ListView
android:id="@+id/listView"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginTop="16dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/button" />
</androidx.constraintlayout.widget.ConstraintLayout>


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