Hello Readers! In this post, we are going to learn how to create and use android numberPicker programmatically in any android application. We will also learn to add numberPicker in linearLayout programmatically in any application.

Output

Tutorialwing Android Dynamic NumberPicker Integer Output

Tutorialwing Android Dynamic NumberPicker String Output

Getting Started

At first, we will create an android application. Then, we will use numberPicker widget in the application.

1. Creating New Project

Follow the steps below to create a new project. Please ignore the steps if you have already created a new project.

Now, we will modify xml and java file to use android numberPicker programmatically.

2. Modify values folder

Open res/values/strings.xml file and add below code into it.

<resources>
	<string name="app_name">DynamicNumberPicker</string>
</resources>

3. Modify Layout Folder

Open res/layout/activity_main.xml file. Then, add below code into it.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
	android:id="@+id/rootContainer"
	xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:orientation="horizontal">

</LinearLayout>

In activity_main.xml file, we have defined linearLayout, with id rootContainer, that will act as container for the numberPicker created dynamically in the application.

We can set two types of data in the numberPicker. They are –
a. Provide Only Integer values in the numberPicker.
b. Provide array of string values in the numberPicker.

4.1 Create Android NumberPicker Programmatically / Dynamically And Set Integer Values

Here, We will create numberPicker dynamically and set integer values in it. So, Open app/src/main/java/com.tutorialwing.dynamicnumberpicker/MainActivity.java file and add below code into it.

package com.tutorialwing.dynamicnumberpicker;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.NumberPicker;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		NumberPicker numberPicker = new NumberPicker(this);
		LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
		numberPicker.setLayoutParams(layoutParams);

		numberPicker.setMinValue(0);
		numberPicker.setMaxValue(10);
		numberPicker.setWrapSelectorWheel(true);
		numberPicker.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {
			@Override
			public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
				String text = "Changed from " + oldVal + " to " + newVal;
				Toast.makeText(MainActivity.this, text, Toast.LENGTH_SHORT).show();
			}
		});

		LinearLayout linearLayout = findViewById(R.id.rootContainer);
		if (linearLayout != null) {
			linearLayout.addView(numberPicker);
		}
	}
}

In MainActivity.java file, we have created numberPicker dynamically as set layout params etc. in it. Then, we have used setMinValue() method to set minimum value in it. After that, we have used setMaxValue() method to set maximum value in it. Then, we have set a listener to show toast message whenever there is change in value selection in numberPicker. At last, we have added numberPicker in linearLayout having id rootContainer.

4.2 Create Android NumberPicker Programmatically / Dynamically And Set Array of String Values

Here, We will create numberPicker dynamically and set array of string values in it. So, Open app/src/main/java/com.tutorialwing.dynamicnumberpicker/MainActivity.java file and add below code into it.

package com.tutorialwing.dynamicnumberpicker;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.NumberPicker;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		NumberPicker numberPicker = new NumberPicker(this);
		LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
		numberPicker.setLayoutParams(layoutParams);

		final String[] values = {"Blue", "Magenta", "Yellow", "Red", "Pink", "White", "Green", "Violet"};
		numberPicker.setMinValue(0);
		numberPicker.setMaxValue(values.length - 1);
		numberPicker.setDisplayedValues(values);
		numberPicker.setWrapSelectorWheel(true);
		numberPicker.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {
			@Override
			public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
				String text = "Changed from " + values[oldVal] + " to " + values[newVal];
				Toast.makeText(MainActivity.this, text, Toast.LENGTH_SHORT).show();
			}
		});

		LinearLayout linearLayout = findViewById(R.id.rootContainer);
		if (linearLayout != null) {
			linearLayout.addView(numberPicker);
		}
	}
}

Here, we have created an array of string values (with name values). Then, we have set minimum and maximum range of values using setMinValue and setMaxValue method. After that, we have used setDisplayedValues() method to set array of string values in numberPicker.

Since AndroidManifest.xml file is very important in any android project. We are also going to see the content inside this file.

AndroidManifest.xml file

Code inside src/main/AndroidManifest.xml file would look like below –

<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.tutorialwing.dynamicnumberpicker"
		  xmlns:android="http://schemas.android.com/apk/res/android">

	<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>

When we run the application, we will get output as shown above.

That’s the end of tutorial on Creating Android NumberPicker Programmatically.