Android编程下拉菜单spinner用法小结(附2则示例)

<?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："  />  <!-- 定义一个城市信息下拉菜单-->  <Spinner  android:id = "@+id/Spinner_city"  android:layout_width = "wrap_content"  android:layout_height ="wrap_content" >  </Spinner > </LinearLayout>

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  }  });  } }

<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/SpinnerId"/></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.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.ArrayAdapter;import android.widget.Spinner;import android.widget.Toast;import android.os.Build;public class MainActivity extends ActionBarActivity { private static final String[] m_arr = {"第一组","第二组","第三组"}; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Spinner _spin = (Spinner)findViewById(R.id.SpinnerId); ArrayAdapter<String> ada = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, m_arr); ada.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); _spin.setAdapter(ada); _spin.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){  public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3){  dispToast("选择的是"+m_arr[arg2]);  arg0.setVisibility(View.VISIBLE);  }  public void onNothingSelected(AdapterView<?> arg0){  //  } }); /*if (savedInstanceState == null) {  getSupportFragmentManager().beginTransaction().add(R.id.container, new PlaceholderFragment()).commit(); }*/ } public void dispToast(String str){ Toast.makeText(this, str, Toast.LENGTH_SHORT).show(); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, 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_main, container, false);  return rootView; } }}

<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>