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How to dynamically update a listView in Android?
This example demonstrates how do I dynamically update a ListView in android.
Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.
Step 2 − Add the following code to res/layout/activity_main.xml.
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:padding="4dp" android:orientation="vertical" > <EditText android:id="@+id/editText" android:layout_width="match_parent" android:layout_height="wrap_content" android:inputType="text" android:hint="Enter an item here" /> <Button android:id="@+id/btnAdd" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Add item" android:layout_below="@id/editText" /> <ListView android:id="@+id/listView" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_below="@id/btnAdd" /> </RelativeLayout>
Step 3 − Add the following code to src/MainActivity.java
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import java.util.ArrayList;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
EditText editText;
Button button;
ListView listView;
ArrayList<String> list = new ArrayList<>();
ArrayAdapter<String> adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = findViewById(R.id.btnAdd);
listView = findViewById(R.id.listView);
editText = findViewById(R.id.editText);
adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, list);
View.OnClickListener onClickListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
list.add(editText.getText().toString());
editText.setText("");
adapter.notifyDataSetChanged();
}
};
button.setOnClickListener(onClickListener);
listView.setAdapter(adapter);
}
}Step 4 − Add the following code to androidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.sample"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from the android studio, open one of your project's activity files and click the Run 
icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −
Updated on: 08-Jul-2020
3K+ Views
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