Android开发之Spinner

芮宁發表於 2020-4-20 20:51:00

<h1>今天课上学习了Spinner,做了一个很简单的程序，现将代码和截图放在这里供大家参考。</h1>
<h1>activity_spinner.xml</h1>
<div class="cnblogs_code">
<pre> 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></pre>
</div>
<h2>MainActivity.java</h2>
<div class="cnblogs_code">
<pre>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 //获取界面布局文件中的Spinner组件
 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 //字符串数组
 35 String[] stringArr1 = {"机器人学院","智慧城市学院","特教学院","城市轨道交通学院"};
 36 String[] stringArr2 = {"软件工程","机械工程","机器人工程","人工智能"};
 37 String[] stringArr3 = {"2016级","2017级","2018级","2019级"};
 38
 39 //创建ArrayAdapter对象
 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 //为Spinner1设置Adapter
 45 spinner1.setAdapter(adapter1);
 46
 47 //为Spinner1设置选中事件监听器
 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 //为Spinner2设置Adapter
 70 spinner2.setAdapter(adapter2);
 71
 72 //为Spinner2设置选中事件监听器
 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 //为Spinner3设置Adapter
 94 spinner3.setAdapter(adapter3);
 95
 96 //为Spinner3设置选中事件监听器
 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 }</pre>
</div>
<h2>效果截图</h2>
<img src="https://img2020.cnblogs.com/blog/2000701/202004/2000701-20200420204249824-1445302010.jpg">
<img src="https://img2020.cnblogs.com/blog/2000701/202004/2000701-20200420204429747-1140797215.jpg">
<h3>备注：开发环境为ADT</h3> 
来源：https://www.cnblogs.com/JQA576324/p/12740352.html

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Android开发之Spinner