Android UI， spinner 下拉选框

1. Spinner  下拉选框

使用系统默认的spinner 可以通过系统提供的 adapter 将 数据和UI联系起来， 但数据一般为一个List<String>, UI 也是固定的。

如果需要自定义内容怎 需要自己 重写adapter ， 并且定义自己的UI

MyActivity2.java , 两个spinner ， 一个使用默认UI， 一个为自定义UI和自定义Adapter

package com.example.uitest;import java.util.ArrayList;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemSelectedListener;import android.widget.ArrayAdapter;import android.widget.Spinner;import android.widget.TextView;import android.widget.Toast;public class MyActivity2 extends Activity {private final String TAG = "myLog";private Spinner spinner;private Spinner spinner2;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.layout_2);showSpinner1();showSpinner2();}private void showSpinner2() {spinner2 = (Spinner) findViewById(R.id.spinner2);ArrayList<User> userList = new ArrayList<User>();userList.add(new User("kevin","zhongshan"));userList.add(new User("xiang","guangzhou"));userList.add(new User("jie","changsha"));UserAdapter userAdapter = new UserAdapter(MyActivity2.this, userList);spinner2.setAdapter(userAdapter);}//使用一般的适配器private void showSpinner1() {spinner = (Spinner) findViewById(R.id.spinner1);//建立数据源String[] strList = getResources().getStringArray(R.array.strList);//建立适配器，连接数据源ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item, strList);//绑定适配器到UI组件spinner.setAdapter(adapter);spinner.setOnItemSelectedListener(new OnItemSelectedListener() {@Overridepublic void onItemSelected(AdapterView<?> arg0, View arg1,int arg2, long arg3) {Toast.makeText(MyActivity2.this, ((TextView)arg1).getText(), Toast.LENGTH_SHORT).show();}@Overridepublic void onNothingSelected(AdapterView<?> arg0) {// TODO Auto-generated method stub}});}}

res/layout/layout2.xml  布局文件， 放入两个 spinner

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <Spinner        android:id="@+id/spinner1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:prompt="@string/spinnerName" />    <Spinner        android:id="@+id/spinner2"        android:layout_width="match_parent"        android:layout_height="wrap_content" /></LinearLayout>

res/value/string.xml;  可以配置一个 array 给spinner使用

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="app_name">UITest</string>    <string name="action_settings">Settings</string>    <string name="hello_world">Hello world!</string>    <string name="spinnerName">My Spinner</string>    <string-array name="strList">        <item>Red</item>        <item>Green</item>        <item>Blue</item>    </string-array>    </resources>

UserAdapter.java   自定义的适配器

package com.example.uitest;import java.util.ArrayList;import java.util.List;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.Adapter;import android.widget.BaseAdapter;import android.widget.TextView;public class UserAdapter extends BaseAdapter {private Context mContext;private ArrayList<User> userList;public UserAdapter(Context context, ArrayList<User> list){mContext = context;userList = list;}@Overridepublic int getCount() {return userList.size();}@Overridepublic Object getItem(int arg0) {return userList.get(arg0);}@Overridepublic long getItemId(int arg0) {return 0;}@Overridepublic View getView(int arg0, View arg1, ViewGroup arg2) {arg1 = LayoutInflater.from(mContext).inflate(R.layout.spinner_view, null);TextView tv1 = (TextView) arg1.findViewById(R.id.textView1);TextView tv2 = (TextView) arg1.findViewById(R.id.textView2);tv1.setText(userList.get(arg0).getUsename());tv2.setText(userList.get(arg0).getAddress());return arg1;}}

res/layout/spinner_view.xml  自定义的spinner 控件

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="horizontal" >    <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="TextView"        android:drawableLeft="@drawable/ic_launcher"        android:padding="3dp" />    <TextView        android:id="@+id/textView2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="TextView"                android:padding="3dp" /></LinearLayout>

User对象定义

package com.example.uitest;public class User {private String usename;private String address;public User(String usename, String address) {super();this.usename = usename;this.address = address;}public String getUsename() {return usename;}public void setUsename(String usename) {this.usename = usename;}public String getAddress() {return address;}public void setAddress(String address) {this.address = address;}}