How to make an android spinner with initial default text?

AndroidApps/ApplicationsMobile Development

This example demonstrates how do I make an android spinner with initial default text 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"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:id="@+id/linearLayout"
   android:orientation="vertical"
   tools:context=".MainActivity">
   <TextView
      android:id="@+id/textView"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Spinner Sample Program"
      android:layout_gravity="center"
      android:layout_marginTop="30dp"
      android:textSize="16sp"/>
   <Spinner
      android:id="@+id/spinner"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_marginTop="10dp"
      android:layout_gravity="center">
   </Spinner>
</LinearLayout>

Step 3 − Add the following code to src/MainActivity.java

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
   Spinner spinner;
   @Override
   public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      spinner = findViewById(R.id.spinner);
      List<String> footballPlayers = new ArrayList<>();
      footballPlayers.add(0, "Select a player from the list");
      footballPlayers.add("Cristian Ronaldo");
      footballPlayers.add("Lionel Messi");
      footballPlayers.add("Neymar Jr");
      footballPlayers.add("Isco");
      footballPlayers.add("Gareth Bale");
      footballPlayers.add("Luis Suarez");
      ArrayAdapter<String> arrayAdapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, footballPlayers);
      arrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
      spinner.setAdapter(arrayAdapter);
      spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
      @Override
      public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
         if (parent.getItemAtPosition(position).equals("Choose Football players from lis")){
            }else {
               String item = parent.getItemAtPosition(position).toString();
               Toast.makeText(parent.getContext(),"Selected: " +item, Toast.LENGTH_SHORT).show();
            }
         }
         @Override
         public void onNothingSelected(AdapterView<?> parent) {
         }
      });
   }
}

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>
</manifet>

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 android studio, open one of your project's activity files and click Run Play Icon icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen –


raja
Published on 29-Aug-2019 13:33:57
Advertisements