Original: Android 0 Basics 58th: Value selector numberpicker
The previous issue learned the date selector DatePicker and time picker timepicker, is not feeling very simple, this issue continues to learn the value selector Numberpicker.
I. Overview of Numberpicker
Numberpicker is a component used to select a set of predefined numbers that can be entered either by the keyboard or by scrolling to select a value.
The common methods of Numberpicker are as follows:
Setminvalue (int minval): Sets the minimum supported value for this component.
Setmaxvalue (int maxval): Sets the maximum value supported by this component.
SetValue (int value): Sets the current value of the component.
Getmaxvalue (): Gets the maximum value set by the component.
Getminvalue (): Gets the minimum value set by the component.
GetValue (): Gets the value displayed by the current component.
SetValue (int value): Sets the value displayed by the current component.
With Numberpicker there are altogether 2 listeners and one formatter format processor,
Numberpicker.onvaluechangelistener: Used to listen for changes to the current value.
Numberpicker.onscrolllistener: The scroll state used to listen for the control. The following three states are mainly included:
Scroll_state_touch_scroll: The user presses down and then slides.
Scroll_state_fling: Equivalent to the subsequent slide operation of the Scroll_state_touch_scroll.
Scroll_state_idle:numberpicker is not scrolling.
Numberpicker.formatter: Used to format the display of value in the component, such as 0-23 formatted as 00-23.
Ii. Examples of Numberpicker
Next, a simple example program is used to learn the use of Numberpicker.
Continue to use the Advancedviewsample module of the Widgetsample project to create a numberpicker_layout.xml file in the app/main/res/layout/directory populated with the following code snippet:
<?XML version= "1.0" encoding= "Utf-8"?><Relativelayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent" > <NumberpickerAndroid:id= "@+id/numberpicker"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:layout_centerhorizontal= "true"/></Relativelayout>
Create a new Numberpickeractivity.java file, load the new layout file above, initialize the Numberpicker and get the user's choice, with the following code:
Packagecom.jinyu.cqkxzsxy.android.advancedviewsample;ImportAndroid.os.Bundle;Importandroid.support.v7.app.AppCompatActivity;ImportAndroid.widget.NumberPicker;ImportAndroid.widget.Toast;/*** @ Creator Xin 鱻 * @ description Android 0 Basic primer to Master Series tutorials, welcome to the public number Shareexpert*/ Public classNumberpickeractivityextendsappcompatactivity {PrivateNumberpicker Mnumberpicker =NULL;//Value Selectors@Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate); Setcontentview (r.layout.numberpicker_layout); //Get Numberpicker ComponentsMnumberpicker =(Numberpicker) Findviewbyid (R.id.numberpicker); //Setting the Numberpicker propertyMnumberpicker.setminvalue (1); Mnumberpicker.setmaxvalue (20); Mnumberpicker.setvalue (5); //Monitor numeric change eventsMnumberpicker.setonvaluechangedlistener (NewNumberpicker.onvaluechangelistener () {@Override Public voidOnvaluechange (Numberpicker picker,intOldval,intnewval) {Toast.maketext (numberpickeractivity). This, "Selected:" +newval, Toast.length_short). Show (); } }); }}
The above program code is the code that Numberpicker binds the event listener, and the listener is triggered when the user chooses the time through this component.
Running the program, you can see the interface effect shown.
In addition to the Android system-defined DatePicker, Timepicker, and Numberpicker, which are often not met in real-world development, some picker components, such as City selectors, gender selectors, picture selectors, color selectors, are often customized.
Can generally borrow third-party components to quickly complete, of course, can also be customized implementation, here do not introduce too much, you can study on their own, welcome to explore together.
Come here today, if you have any questions welcome message to discuss together, also welcome to join the Android 0 Basic introductory Technical discussion group, grow together!
This article copyright for the public Share talent show (Shareexpert)--Xin 鱻 all, if necessary reprint please contact the author authorized, hereby declare!
Past period Summary share:
Android 0 Basics Introduction 1th: Android's past life
Android 0 Basics Section 2nd: Android system Architecture and application components those things
Android 0 Basics Section 3rd: Bring you up to talk about Android development environment
Android 0 Basics 4th: Installing and configuring the JDK correctly Ko fu the first trick
Android 0 Basics 5th: Use ADT bundles to easily meet the goddess
Android 0 Basics 6th: Configuration Optimization SDK Manager, official dating goddess
Android 0 Basics 7th: Take care of Android simulator and start the Sweet journey
Android 0 Basics 8th: HelloWorld, the starting point for my first trip
Android 0 Basics 9th: Android app, no code can be developed
Android 0 Basics Section 10th: Development IDE Big upgrade, finally ushered in Android Studio
Android 0 Basics Introductory Section 11th: Simple steps to take you to fly, run Android Studio project
Android 0 Basics 12th: Get familiar with the Android studio interface and start selling
Android 0 Basics 13th: Android Studio Configuration optimization to create a development tool
Android 0 Basics 14th: Using high-speed genymotion, stepping into the rocket era
Android 0 Basics Section 15th: Mastering the Android Studio project structure, sailing
Android 0 Basics Section 16th: Android User Interface Development overview
Android 0 Basics Section 17th: text box TextView
Android 0 Basics Section 18th: Input box EditText
Android 0 Basics Get started section 19th: Buttons button
Android 0 Basics 20th: check box checkbox and radio button radiobutton
Android 0 Basics Section 21st: Switch Components ToggleButton and switch
Android 0 Basics Section 22nd: Image View ImageView
Android 0 Basics Section 23rd: Image button ImageButton and zoom button Zoombutton
Android 0 Basics Section 24th: Customize view simple to use to create your own controls
Android 0 Basics Section 25th: Simple and most commonly used linearlayout linear layouts
Android 0 Basics Section 26th: Two alignments, layout_gravity and gravity differ greatly
Android 0 Basics section 27th: Using padding and margin correctly
Android 0 Basics Section 28th: Easy to master relativelayout relative layout
Android 0 Basics 29th: Use tablelayout table layouts
Android 0 Basics 30th: Two minutes master Framelayout frame layout
Android 0 Basics Section 31st: absolutelayout absolute Layout with less
Android 0 Basics Section 32nd: New GridLayout Grid layout
Android 0 Basics section 33rd: Android Event Handling overview
Android 0 Basics Section 34th: Listening-based event handling in Android
Android 0 Basics Section 35th: Callback-based event handling in Android
Android 0 Basics Section 36th: Handling of Android system events
Android 0 Basics 37th: First Knowledge ListView
Android 0 Basics 38th: First Knowledge Adapter
Android 0 Basics section 39th: listactivity and custom list items
Android 0 Basics Section 40th: Customizing Arrayadapter
Android 0 Basics Section 41st: Using Simpleadapter
Android 0 Basics Section 42nd: Customizing Baseadapter
Android 0 Basics section 43rd: ListView Optimization and List End-to-end use
Android 0 Basics Section 44th: ListView Data Dynamic Update
Android 0 Basic Getting Started section 45th: Grid view GridView
Android 0 Basics section 46th: List Options Box spinner
Android 0 Basic Getting Started section 47th: AutoComplete text Box Autocompletetextview
Android 0 Basics Section 48th: Collapsible list Expandablelistview
Android 0 Basics section 49th: Adapterviewflipper picture Carousel
Android 0 Basics Section 50th: StackView card Stacking
Android 0 Basics Section 51st: progress bar ProgressBar
Android 0 Basics section 52nd: Customizing ProgressBar Cool progress bar
Android 0 Basics 53rd: Drag bar Seekbar and star rating bar Ratingbar
Android 0 Basics section 54th: View switch Components Viewswitcher
Android 0 Basics Section 55th: Imageswitcher and Textswitcher
Android 0 Basics Section 56th: Flip View Viewflipper
Android 0 Basics Section 57th: DatePicker and Timepicker selectors
Android 0 Basics Section 58th: Value selector numberpicker