Friday, August 14, 2015

How to set prompt text in a Spinner in Android

activity_main.xml

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/rl"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp"
    tools:context=".MainActivity"
    android:background="#66a5f9"
    >
    <Spinner
        android:id="@+id/spinner"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:spinnerMode="dialog"
        />
</RelativeLayout>
spinner_item.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="10dp"
    android:textStyle="italic"
    android:fontFamily="sans-serif-medium"
    />
MainActivity.java

package com.cfsuman.me.androidcodesnippets;

import android.graphics.Color;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;

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 reference of widgets from XML layout
        final Spinner spinner = (Spinner) findViewById(R.id.spinner);

        // Initializing a String Array
        String[] plants = new String[]{
                "Laceflower",
                "California sycamore",
                "Mountain mahogany",
                "Butterfly weed",
                "Carrot weed"
        };

        final List<String> plantsList = new ArrayList<>(Arrays.asList(plants));

        // Initializing an ArrayAdapter
        final ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(
                this,R.layout.spinner_item,plantsList){
            @Override
            public View getDropDownView(int position, View convertView,
                                        ViewGroup parent) {
                View view = super.getDropDownView(position, convertView, parent);
                TextView tv = (TextView) view;
                if(position%2 == 1) {
                    // Set the item background color
                    tv.setBackgroundColor(Color.parseColor("#FFF9A600"));
                }
                else {
                    // Set the alternate item background color
                    tv.setBackgroundColor(Color.parseColor("#FFE49200"));
                }
                return view;
            }
        };

        /*
            public void setPrompt (CharSequence prompt)
                Sets the prompt to display when the dialog is shown.
         */
        spinner.setPrompt("Select an item");

        spinnerArrayAdapter.setDropDownViewResource(R.layout.spinner_item);
        spinner.setAdapter(spinnerArrayAdapter);
   }
}
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