Drop-down list box spinner

In the androidapp Application, the drop-down list box Spinner frequency is quite high, if you are unfamiliar with Spinner , you will not the Select in HTML is unfamiliar, their role is the same, are more than select one. We need to learn the basic controls in Android drop-down list box Spinner.

First, the Design login window

Open the "res/layout/activity_main.xml" file.

 1 activity 1 spinner 1 buttons button 2 All controls are from form widgets

2, new province.xml pieces.

Create a new province.xml file in the "res/values" location .

(1) The location of the Province.xml file is as follows:

Province.xml content is as follows:

<?xml version= "1.0" encoding= "Utf-8"?>

<resources>

<string-array name= "Provarray" >

<item> Henan Province </item>

<item> Hebei province </item>

<item> Shandong Province </item>

<item> Shanxi Province </item>

</string-array>

</resources>

3.Open the activity_main.xml file.

We have modified the auto-generated code to the following code, specifically:

(1 spinner id modified to province

Note: android:entries= "@array/provarray" , which means spinner items using province.xml Span style= "font-family: ' The song Body '; The provarray

(2)buttion 's ID is modified to saveand its text is modified to " Save " .

<spinner

Android:id= "@+id/province"

Android:layout_width= "Wrap_content"

android:layout_height= "Wrap_content"

Android:layout_alignparentright= "true"

Android:layout_centervertical= "true"

android:entries= "@array/provarray"/>

<button

Android:id= "@+id/save"

Android:layout_width= "Wrap_content"

android:layout_height= "Wrap_content"

android:layout_alignleft= "@+id/province"

Android:layout_alignparentbottom= "true"

Android:layout_marginbottom= "76DP"

android:layout_marginleft= "23DP"

android:text= "@string/save"/>

Second, click event

Open the "Src/com.genwoxue.spinnerapp/mainactivity.java" file.

Then enter the following code:

Package COM.EXAMPLE.HW;

Import android.app.Activity;

Import Android.os.Bundle;

Import Android.view.Menu;

Import Android.view.View;

Import Android.view.View.OnClickListener;

Import Android.widget.Button;

Import Android.widget.Spinner;

Import Android.widget.Toast;

public class Mainactivity extends Activity {

Private Button btnsave = null;

Private Spinner spinprovice = null;

@Override

protected void OnCreate (Bundle savedinstancestate) {

Super.oncreate (savedinstancestate);

Setcontentview (R.layout.activity_main);

Btnsave = (Button) Super.findviewbyid (R.id.save);

Spinprovice = (Spinner) Findviewbyid (r.id.province);

Btnsave.setonclicklistener (New Onclicklistener () {

public void OnClick (View v) {

String SPro = "";

String sinfo = "";

SPro = Spinprovice.getselecteditem (). toString ();

Sinfo = "province:" +spro;

Toast.maketext (Getapplicationcontext (), Sinfo, Toast.length_short). Show ();

}

});

}

@Override

public boolean Oncreateoptionsmenu (Menu menu) {

Inflate the menu; This adds items to the action bar if it is present.

Getmenuinflater (). Inflate (R.menu.main, menu);

return true;

}

}

In the above code, we focus on a light blue background section.

　　1 , section ① Part

Import The packages associated with the Spinner.

　　2 , section ② Part

Declares a 2 control variable.

　　3 , section ③ Part

(1)theFindviewbyid () method completes The capture of 2 controls.

(2)" save " button to add click Listen Event:Btnsave.setonclicklistener (new Saveonclicklistener ()).

　　4 , section ④ Part

(1) We create a new anonymous inner class Onclicklistener to enable click event Snooping.

(2)spinner.getselecteditem () Gets the value of the current selection.

(3)toast.maketext (Getapplicationcontext (), Sinfo,toast.length_short). Show () Tips for displaying selections: Shandong Province, for example.

This article is from the "No Water Fish" blog, please be sure to keep this source http://javaqun.blog.51cto.com/10687700/1705472

Drop-down list box spinner