android下拉菜单spinner的使用方法
16lz
2021-01-23
Spinner控件也是一种列表类型的控件,它的继承关系如下:
Java.lang.Object
↳ Android.view.View
↳ android.view.ViewGroup
↳ android.widget.AdapterView
↳ android.widget.AbsSpinner
↳ android.widget.Spinner
android.widget.Spinner继承了android.view.ViewGroup类。
在Android的UI开发中,Spinner(下拉列表)总是可以用到的,一个简单的自定义Spinner制作我们只需要记住这重要的五步,一个Spinner就可以应用而生了。
(1)新建一个android工程,名称为Spinner。同时建一个Activity,名称为SpinnerActivity。
(2)修改res/layout/main.xml
[html] view plain copy print ?- <?xml version=“1.0” encoding=“utf-8”?>
- <LinearLayout xmlns:android=“http://schemas.android.com/apk/res/android”
- android:orientation=“vertical”
- android:layout_width=“fill_parent”
- android:layout_height=“fill_parent”
- >
- <TextView
- android:id = “@+id/TextView_city”
- android:layout_width = “wrap_content”
- android:layout_height = “wrap_content”
- android:text = “所在城市:”
- />
- <Spinner
- android:id = “@+id/Spinner_city”
- android:layout_width = “wrap_content”
- android:layout_height =“wrap_content” >
- Spinner >
- LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
(3)SpinnerActivity.java 代码。
[java] view plain copy print ?- package cn.com;
- import java.util.ArrayList;
- import java.util.List;
- import android.app.Activity;
- import android.os.Bundle;
- import android.view.MotionEvent;
- import android.view.View;
- import android.widget.AdapterView;
- import android.widget.ArrayAdapter;
- import android.widget.Spinner;
- import android.widget.TextView;
- public class SpinnerActivity extends Activity {
- /** Called when the activity is first created. */
- private List
list = new ArrayList(); - private TextView myTextView;
- private Spinner mySpinner;
- private ArrayAdapter
adapter; - @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- //第一步:添加一个下拉列表项的list,这里添加的项就是下拉列表的菜单项
- list.add(”北京”);
- list.add(”上海”);
- list.add(”深圳”);
- list.add(”福州”);
- list.add(”厦门”);
- myTextView = (TextView)findViewById(R.id.TextView_city);
- mySpinner = (Spinner)findViewById(R.id.Spinner_city);
- //第二步:为下拉列表定义一个适配器,这里就用到里前面定义的list。
- adapter = new ArrayAdapter
( this,android.R.layout.simple_spinner_item, list); - //第三步:为适配器设置下拉列表下拉时的菜单样式。
- adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
- //第四步:将适配器添加到下拉列表上
- mySpinner.setAdapter(adapter);
- //第五步:为下拉列表设置各种事件的响应,这个事响应菜单被选中
- mySpinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){
- public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
- // TODO Auto-generated method stub
- /* 将所选mySpinner 的值带入myTextView 中*/
- myTextView.setText(”您选择的是:”+ adapter.getItem(arg2));
- /* 将mySpinner 显示*/
- arg0.setVisibility(View.VISIBLE);
- }
- public void onNothingSelected(AdapterView<?> arg0) {
- // TODO Auto-generated method stub
- myTextView.setText(”NONE”);
- arg0.setVisibility(View.VISIBLE);
- }
- });
- /*下拉菜单弹出的内容选项触屏事件处理*/
- mySpinner.setOnTouchListener(new Spinner.OnTouchListener(){
- public boolean onTouch(View v, MotionEvent event) {
- // TODO Auto-generated method stub
- /**
- *
- */
- return false;
- }
- });
- /*下拉菜单弹出的内容选项焦点改变事件处理*/
- mySpinner.setOnFocusChangeListener(new Spinner.OnFocusChangeListener(){
- public void onFocusChange(View v, boolean hasFocus) {
- // TODO Auto-generated method stub
- }
- });
- }
- }
package cn.com;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.view.MotionEvent;import android.view.View;import android.widget.AdapterView;import android.widget.ArrayAdapter;import android.widget.Spinner;import android.widget.TextView;public class SpinnerActivity extends Activity { /** Called when the activity is first created. */ private List list = new ArrayList(); private TextView myTextView; private Spinner mySpinner; private ArrayAdapter adapter; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //第一步:添加一个下拉列表项的list,这里添加的项就是下拉列表的菜单项 list.add("北京"); list.add("上海"); list.add("深圳"); list.add("福州"); list.add("厦门"); myTextView = (TextView)findViewById(R.id.TextView_city); mySpinner = (Spinner)findViewById(R.id.Spinner_city); //第二步:为下拉列表定义一个适配器,这里就用到里前面定义的list。 adapter = new ArrayAdapter(this,android.R.layout.simple_spinner_item, list); //第三步:为适配器设置下拉列表下拉时的菜单样式。 adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); //第四步:将适配器添加到下拉列表上 mySpinner.setAdapter(adapter); //第五步:为下拉列表设置各种事件的响应,这个事响应菜单被选中 mySpinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){ public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) { // TODO Auto-generated method stub /* 将所选mySpinner 的值带入myTextView 中*/ myTextView.setText("您选择的是:"+ adapter.getItem(arg2)); /* 将mySpinner 显示*/ arg0.setVisibility(View.VISIBLE); } public void onNothingSelected(AdapterView<?> arg0) { // TODO Auto-generated method stub myTextView.setText("NONE"); arg0.setVisibility(View.VISIBLE); } }); /*下拉菜单弹出的内容选项触屏事件处理*/ mySpinner.setOnTouchListener(new Spinner.OnTouchListener(){ public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub /** * */ return false; } }); /*下拉菜单弹出的内容选项焦点改变事件处理*/ mySpinner.setOnFocusChangeListener(new Spinner.OnFocusChangeListener(){ public void onFocusChange(View v, boolean hasFocus) { // TODO Auto-generated method stub } }); } }
运行结果如下图所示:
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