Android编程下拉菜单spinner用法小结(附2则示例)

本文较为详细的总结分析了Android编程下拉菜单spinner用法。分享给大家供大家参考，具体如下：

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<Textends android.widget.Adapter>
         ↳ 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

<?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>

(3)SpinnerActivity.java 代码

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<String> list = new ArrayList<String>(); private TextView myTextView; private Spinner mySpinner; private ArrayAdapter<String> 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<String>(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：

补充：Spinner控件用法示例2则

用法1：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/container" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" tools:context="com.example.mars_2100_spinner.MainActivity" tools:ignore="MergeRootFrame" > <Spinner android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/SpinnerId2"/> <TextView android:id="@+id/textView1" android:layout_width="fill_parent" android:layout_height="wrap_content"/> <Spinner android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/SpinnerId3"/> <TextView android:id="@+id/textView2" android:layout_width="fill_parent" android:layout_height="wrap_content"/> </LinearLayout> package com.example.mars_2100_spinner; import android.support.v7.app.ActionBarActivity; import android.support.v7.app.ActionBar; import android.support.v4.app.Fragment; import android.app.Activity; import android.os.Bundle; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.AdapterView.OnItemSelectedListener; import android.widget.ArrayAdapter; import android.widget.Spinner; import android.widget.TextView; import android.os.Build; public class Main02Activity extends Activity { static final String[] CONSTELLATIONS = new String[] { "白羊座", "金牛座", "双子座", "巨蟹座", "狮子座", "处女座", "天枰座", "天蝎座", "射手座", "魔蝎座", "水瓶座", "双鱼座" }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main02); final TextView txt2 = (TextView) findViewById(R.id.textView1); Spinner s1 = (Spinner) findViewById(R.id.SpinnerId2); final ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.planets_array, android.R.layout.simple_spinner_item); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); s1.setAdapter(adapter); s1.setPrompt("测试"); s1.setOnItemSelectedListener(new OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { txt2.setText(adapter.getItem(position).toString()); } @Override public void onNothingSelected(AdapterView<?> parent) { txt2.setText("没选中的"); } }); final TextView txt4 = (TextView) findViewById(R.id.textView2); Spinner s2 = (Spinner) findViewById(R.id.SpinnerId3); ArrayAdapter<CharSequence> adapterC = new ArrayAdapter<CharSequence>(this, android.R.layout.simple_spinner_item, CONSTELLATIONS); adapterC.setDropDownViewResource(android.R.layout.simple_spinner_item); s2.setAdapter(adapterC); s2.setOnItemSelectedListener(new OnItemSelectedListener() { public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { txt4.setText(CONSTELLATIONS[position]); } public void onNothingSelected(AdapterView<?> parent) { txt4.setText("没选中的"); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main02, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } /** * A placeholder fragment containing a simple view. */ public static class PlaceholderFragment extends Fragment { public PlaceholderFragment() { } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_main02, container, false); return rootView; } } } <?xml version="1.0" encoding="utf-8"?> <resources> <string name="app_name">Mars_2100_Spinner</string> <string name="hello_world">Hello world!</string> <string name="action_settings">Settings</string> <string-array name="planets_array"> <item>Mercury</item> <item>Venus</item> <item>Earth</item> <item>Mars</item> <item>Jupiter</item> <item>Saturn</item> <item>Uranus</item> <item>Neptune</item> </string-array> <string name="title_activity_main02">Main02Activity</string> </resources>

希望本文所述对大家Android程序设计有所帮助。

时间： 2024-04-19 03:10:43

Android编程下拉菜单spinner用法小结(附2则示例)

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