Greetings!
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Output

Tutorialwing Kotlin Dynamic NumberPicker Integer Output

Tutorialwing Kotlin Dynamic NumberPicker String Output
Getting Started
At first, we will create android project. Then, we will create and use numberPicker programmatically in kotlin file.
1. Creating New Project in Kotlin
Follow the steps below to create new project. Please ignore the steps if you have already created a new project.
Step | Description |
---|---|
1. | Open Android Studio. |
2. | Go to File => New => New Project. Write application name as DynamicNumberPicker. Then, check Include Kotlin Support and click next button. |
3. | Select minimum SDK you need. However, we have selected 17 as minimum SDK. Then, click next button |
4. | Then, select Empty Activity => click next => click finish. |
5. | At this point, You will get a newly created android project successfully. |
Now, we will modify xml and kotlin file to use numberPicker dynamically.
2. Modify Values Folder
Open res/values/strings.xml file. Then, 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.
NumberPicker widget can accepts two types of data. They are –
a. Integer values.
b. Array of String values.
Now, we will see how we can provide each data types to the numberPicker.
4.1 Create Android NumberPicker Programmatically / Dynamically in Kotlin And Show Integer Values
Open app/src/main/java/com.tutorialwing.dynamicnumberpicker/MainActivity.kt file. Then, 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 class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val numberPicker = NumberPicker(this) val layoutParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT) numberPicker.layoutParams = layoutParams numberPicker.minValue = 0 numberPicker.maxValue = 10 numberPicker.wrapSelectorWheel = true numberPicker.setOnValueChangedListener { picker, oldVal, newVal -> val text = "Changed from $oldVal to $newVal" Toast.makeText(this@MainActivity, text, Toast.LENGTH_SHORT).show() } val linearLayout = findViewById<LinearLayout>(R.id.rootContainer) linearLayout?.addView(numberPicker) } }
Here, We have created numberPicker programmatically in kotlin file. After that, we have configured numberPicker to show range of integer values. minValue is used to set minimum value in range. maxValue is used to set maximum value in range. wrapSelectorWheel is used to specify whether we want to show start value of range if we have reached to end. We have also defined a listener that displays a toast message whenever there is change in value selection in numberPicker. Finally, we have added numberPicker widget in linearLayout.
4.2 Create Android NumberPicker Programmatically / Dynamically in Kotlin And Show Array Of String Values
Open app/src/main/java/com.tutorialwing.dynamicnumberpicker/MainActivity.kt file. Then, 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 class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val numberPicker = NumberPicker(this) val layoutParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT) numberPicker.layoutParams = layoutParams val values = arrayOf("Blue", "Magenta", "Yellow", "Red", "Pink", "White", "Green", "Violet") numberPicker.minValue = 0 numberPicker.maxValue = values.size - 1 numberPicker.displayedValues = values numberPicker.wrapSelectorWheel = true numberPicker.setOnValueChangedListener { picker, oldVal, newVal -> val text = "Changed from " + values[oldVal] + " to " + values[newVal] Toast.makeText(this@MainActivity, text, Toast.LENGTH_SHORT).show() } val linearLayout = findViewById<LinearLayout>(R.id.rootContainer) linearLayout?.addView(numberPicker) } }
Here, we have created numberPicker programmatically in kotlin file. After that, we have configured it to show array of string values. Variable values represents array of string values that we will provide to numberPicker. We have provided data to the numberPicker using displayedValues attribute.
Since AndroidManifest.xml file is very important in any android application, we are also going to see the content inside this file.
AndroidManifest.xml file
Code inside src/main/AndroidManifest.xml file is –
<?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 program, we will get output as shown above.
That’s end of our tutorial on Creating Android NumberPicker Programmatically in Kotlin.