android spinner 两种列表和 ArrayList

接下来我将以以下顺序来讲解spinner是如何使用的

一、xml界面代码解释

1.一些属性讲解

二、java代码解释

1.没有绑定adapter

2.有绑定adapter

3.ArrayList讲解

4.利用ArrayList来创建下拉菜单

一、

在后缀为 .xml 文件里

首先我先<sprinner></sprinner>这个就是sprinner控件

接下来我先讲解属性

1. android :entries= "@array/languages" 这里是引用在values/array里的数组它的代码如下：

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

< resources >

< string-array name= "languages" >

< item >c语言</ item >

< item >java </ item >

< item >php</ item >

< item >xml</ item >

< item >html</ item >

</ string-array >

</ resources>

2. android :spinnerMode= "dropdown" dropdown 是出来的是下拉框 dialog 是出来一个覆盖全屏的对话框

如下图：

对话框

下拉框

接下来给出所有 xml代码（重点代码会标记为红色）

MainActivity.xml代码

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

< LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android"

android :orientation= "vertical"

xmlns: tools = "http://schemas.android.com/tools"

android :id= "@+id/activity_main"

android :layout_width= "match_parent"

android :layout_height= "match_parent"

tools :context= "com.example.asus.spinner.MainActivity" >

< Spinner

android:id="@+id/spinner1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:entries="@array/languages"

android:spinnerMode="dropdown"

/> 

< Spinner

android :layout_width= "wrap_content"

android :layout_height= "wrap_content"

android :id= "@+id/spinner2" ></ Spinner >

< Spinner

android :layout_width= "wrap_content"

android :layout_height= "wrap_content"

android :id= "@+id/spinner3"

android :spinnerMode= "dropdown"

android :dropDownWidth= "fill_parent" ></ Spinner >

</ LinearLayout >

arryy.xml

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

< resources >

< string-array name= "languages" >

< item >c语言</ item >

< item >java </ item >

< item >php</ item >

< item >xml</ item >

< item >html</ item >

</ string-array >

</ resources>

二、（这里用的xml代码可以用上面的来）

1.没有绑定adapter

Spinner spinner=(Spinner)findViewById(R.id. spinner1 );

spinner.setOnItemSelectedListener( new AdapterView.OnItemSelectedListener() {

@Override

public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

String[] languages1=getResources().getStringArray( languages );

Toast. makeText (MainActivity. this , "你点击的是" +languages1[position],Toast. LENGTH_LONG ).show();

}

@Override

public void onNothingSelected(AdapterView<?> parent) {

}

});

2.有绑定adapter

Spinner spinner2=(Spinner)findViewById(R.id. spinner2 );

String [] mItems=getResources().getStringArray( languages );

ArrayAdapter<String> adapter1= new ArrayAdapter<String>( this ,R.layout. support_simple_spinner_dropdown_item ,mItems);

adapter1.setDropDownViewResource(R.layout. support_simple_spinner_dropdown_item ); //有这句与没有这句显示出来的菜单样式不一样，没有就会和原本的按钮一个样式

spinner2.setAdapter(adapter1);

spinner2.setOnItemSelectedListener( new AdapterView.OnItemSelectedListener() {

@Override

public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

String[] languages2=getResources().getStringArray( languages );

Toast. makeText (MainActivity. this , "你点击的是" +languages2[position],Toast. LENGTH_LONG ).show();

}

@Override

public void onNothingSelected(AdapterView<?> parent) {

}

});

3.ArrayList 浅谈

ArrayList 其实就是一个类，你可以把它想象成一个线性表，只不过是中间不能有NULL。

ArrayList<类> 这里面是自定义的类，表示这个线性表里要添加的类（其实ArrayList 就是一张线性表而已，它提供了函数来操作）

下面的例子因为String类他有自定义的类来接受，所以有add（int,string）,remove(int)；

4.利用arraylist来创建下拉菜单

Spinner spinner3 =(Spinner)findViewById(R.id. spinner3 );

final ArrayList<String>person= new ArrayList<String>();

person.add( 0 , "王泽" );

person.add( 1 , "神人" );

person.add( 2 , "俞少" );

person.remove( 1 );

ArrayAdapter adapter= new ArrayAdapter( this ,R.layout. support_simple_spinner_dropdown_item ,person);

spinner3.setAdapter(adapter);

spinner3.setOnItemSelectedListener( new AdapterView.OnItemSelectedListener() {

@Override

public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

Toast. makeText (MainActivity. this , "你选择了" + person .get(position),Toast. LENGTH_LONG ).show();

}

@Override

public void onNothingSelected(AdapterView<?> parent) {

}

});

下面是全部.java代码

MainActivity.java

package com.example.asus.spinner;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.AdapterView;

import android.widget.ArrayAdapter;

import android.widget.Spinner;

import android.widget.Toast;

import java.util.ArrayList;

import static com.example.asus.spinner.R.array. languages ;

public class MainActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super .onCreate(savedInstanceState);

setContentView(R.layout. activity_main );

//不用adapter 绑定 spinner

Spinner spinner=(Spinner)findViewById(R.id. spinner1 );

spinner.setOnItemSelectedListener( new AdapterView.OnItemSelectedListener() {

@Override

public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

String[] languages1=getResources().getStringArray( languages );

Toast. makeText (MainActivity. this , "你点击的是" +languages1[position],Toast. LENGTH_LONG ).show();

}

@Override

public void onNothingSelected(AdapterView<?> parent) {

}

});

//利用adapter 绑定 spinner

Spinner spinner2=(Spinner)findViewById(R.id. spinner2 );

String [] mItems=getResources().getStringArray( languages );

ArrayAdapter<String> adapter1= new ArrayAdapter<String>( this ,R.layout. support_simple_spinner_dropdown_item ,mItems);

adapter1.setDropDownViewResource(R.layout. support_simple_spinner_dropdown_item ); //有这句与没有这句显示出来的菜单样式不一样，没有就会和原本的按钮一个样式

spinner2.setAdapter(adapter1);

spinner2.setOnItemSelectedListener( new AdapterView.OnItemSelectedListener() {

@Override

public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

String[] languages2=getResources().getStringArray( languages );

Toast. makeText (MainActivity. this , "你点击的是" +languages2[position],Toast. LENGTH_LONG ).show();

}

@Override

public void onNothingSelected(AdapterView<?> parent) {

}

});

Spinner spinner3 =(Spinner)findViewById(R.id. spinner3 );

final ArrayList<String>person= new ArrayList<String>();

person.add( 0 , "王泽" );

person.add( 1 , "神人" );

person.add( 2 , "俞少" );

person.remove( 1 );

ArrayAdapter adapter= new ArrayAdapter( this ,R.layout. support_simple_spinner_dropdown_item ,person);

spinner3.setAdapter(adapter);

spinner3.setOnItemSelectedListener( new AdapterView.OnItemSelectedListener() {

@Override

public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

Toast. makeText (MainActivity. this , "你选择了" + person .get(position),Toast. LENGTH_LONG ).show();

}

@Override

public void onNothingSelected(AdapterView<?> parent) {

}

});

}

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android spinner 两种列表 和 ArrayList

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