今天課上學習了Spinner,做了一個很簡單的程式，現將代碼和截圖放在這里供大家參考，

activity_spinner.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:tools="http://schemas.android.com/tools"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     android:orientation="horizontal" 
 7     tools:context=".MainActivity">
 8     
 9     <Spinner
10         android:id="@+id/spinner1"
11         android:layout_width="wrap_content"
12         android:layout_height="wrap_content"
13         android:layout_marginTop="5dp"
14         android:layout_weight="1" />
15 
16     <Spinner
17         android:id="@+id/spinner2"
18         android:layout_width="wrap_content"
19         android:layout_height="wrap_content"
20         android:layout_marginTop="5dp"
21         android:layout_weight="1" />
22     
23     <Spinner
24         android:id="@+id/spinner3"
25         android:layout_width="wrap_content"
26         android:layout_height="wrap_content"
27         android:layout_marginTop="5dp"
28         android:layout_weight="1" />
29     
30 </LinearLayout>

MainActivity.java

  1 package com.example.spinner;
  2 
  3 import android.os.Bundle;
  4 import android.app.Activity;
  5 import android.view.Menu;
  6 import android.view.View;
  7 import android.widget.AdapterView;
  8 import android.widget.AdapterView.OnItemSelectedListener;
  9 import android.widget.ArrayAdapter;
 10 import android.widget.Spinner;
 11 import android.widget.TextView;
 12 import android.widget.Toast;
 13 
 14 public class MainActivity extends Activity {
 15 
 16     private StringBuffer stringBuffer;
 17     protected String str3;
 18     protected String str2;
 19     protected String str1;
 20    
 21 
 22     @Override
 23     protected void onCreate(Bundle savedInstanceState) {
 24         super.onCreate(savedInstanceState);
 25         setContentView(R.layout.activity_spinner);
 26         
 27         stringBuffer = new StringBuffer();
 28         
 29         //獲取界面布局檔案中的Spinner組件
 30         Spinner spinner1 = (Spinner) findViewById(R.id.spinner1);
 31         Spinner spinner2 = (Spinner) findViewById(R.id.spinner2);
 32         Spinner spinner3 = (Spinner) findViewById(R.id.spinner3);
 33         
 34         //字串陣列
 35         String[] stringArr1 = {"機器人學院","智慧城市學院","特教學院","城市軌道交通學院"};
 36         String[] stringArr2 = {"軟體工程","機械工程","機器人工程","人工智能"};
 37         String[] stringArr3 = {"2016級","2017級","2018級","2019級"};
 38         
 39         //創建ArrayAdapter物件
 40         ArrayAdapter<String> adapter1 = new ArrayAdapter(MainActivity.this,android.R.layout.simple_spinner_item,stringArr1);
 41         ArrayAdapter<String> adapter2 = new ArrayAdapter(MainActivity.this,android.R.layout.simple_spinner_item,stringArr2);
 42         ArrayAdapter<String> adapter3 = new ArrayAdapter(MainActivity.this,android.R.layout.simple_spinner_item,stringArr3);
 43         
 44         //為Spinner1設定Adapter
 45         spinner1.setAdapter(adapter1);
 46         
 47         //為Spinner1設定選中事件監聽器
 48         spinner1.setOnItemSelectedListener(new OnItemSelectedListener(){
 49 
 50             @Override
 51             public void onItemSelected(AdapterView<?> parent, View view,
 52                     int position, long id) {
 53                 // TODO Auto-generated method stub
 54                 
 55                 TextView tv = (TextView) view;
 56                 str1 = tv.getText().toString();
 57                 add();
 58                 
 59             }
 60 
 61             @Override
 62             public void onNothingSelected(AdapterView<?> parent) {
 63                 // TODO Auto-generated method stub
 64                 
 65             }
 66             
 67         } );
 68         
 69         //為Spinner2設定Adapter
 70         spinner2.setAdapter(adapter2);
 71         
 72         //為Spinner2設定選中事件監聽器
 73         spinner2.setOnItemSelectedListener(new OnItemSelectedListener(){
 74 
 75             @Override
 76             public void onItemSelected(AdapterView<?> parent, View view,
 77                     int position, long id) {
 78                 // TODO Auto-generated method stub
 79                 
 80                 TextView tv = (TextView) view;
 81                 str2 = tv.getText().toString();
 82                 add();
 83             }
 84 
 85             @Override
 86             public void onNothingSelected(AdapterView<?> parent) {
 87                 // TODO Auto-generated method stub
 88                 
 89             }
 90             
 91         });
 92         
 93         //為Spinner3設定Adapter
 94         spinner3.setAdapter(adapter3);
 95         
 96         //為Spinner3設定選中事件監聽器
 97         spinner3.setOnItemSelectedListener(new OnItemSelectedListener(){
 98 
 99             @Override
100             public void onItemSelected(AdapterView<?> parent, View view,
101                     int position, long id) {
102                 // TODO Auto-generated method stub
103                 
104                 TextView tv = (TextView) view;
105                 str3 = tv.getText().toString();
106                 add();
107                  
108             }
109 
110             @Override
111             public void onNothingSelected(AdapterView<?> parent) {
112                 // TODO Auto-generated method stub
113             
114             }
115             
116         });
117         
118     }
119 
120 
121     protected void add() {
122         // TODO Auto-generated method stub
123         stringBuffer.delete(0, stringBuffer.length());
124         show(str1,str2,str3);
125         Toast.makeText(MainActivity.this, stringBuffer, Toast.LENGTH_LONG)
126           .show();
127     }
128 
129 
130     private void show(String str1, String str2, String str3) {
131         // TODO Auto-generated method stub
132         stringBuffer.append(str1).append("--");
133         stringBuffer.append(str2).append("--");
134         stringBuffer.append(str3);
135     }
136 
137 
138     @Override
139     public boolean onCreateOptionsMenu(Menu menu) {
140         // Inflate the menu; this adds items to the action bar if it is present.
141         getMenuInflater().inflate(R.menu.main, menu);
142         return true;
143     }
144     
145 }

效果截圖

備注：開發環境為ADT

標籤：Android

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