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"

/><!--spinnerMode 是看你跳出来的 框框还是下拉菜单-->

<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) {

}

});

}

}