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  • demo07

    city_data.xml
    <?xml version="1.0" encoding="utf-8"?>
    <resources>
    
        <string-array name="city_labels">
            <item>中国-北京</item>
            <item>中国-上海</item>
            <item>中国-长沙</item>
        </string-array>
    
    </resources>
    ============================
    strings.xml
    <?xml version="1.0" encoding="utf-8"?>
    <resources>
    
        <string name="app_name" >Demo07CityArea
        </string>
        <string name="action_settings" >Settings
        </string>
        <string name="city_prompt" >你喜欢的城市:
        </string>
        <string name="area_prompt" >你喜欢的城区:
        </string>
    
    </resources>
    ==============activity_main.xml===============
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        android:paddingBottom="@dimen/activity_vertical_margin"
        tools:context=".MainActivity">
    
        <!--prompt提示-->
    
        <Spinner
            android:id="@+id/city"
            android:prompt="@string/city_prompt"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:entries="@array/city_labels"
            />
    
        <Spinner
            android:id="@+id/area"
            android:prompt="@string/area_prompt"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
    </LinearLayout>
    
    ================================
    package com.example.demo07cityarea;
    
    import android.os.Bundle;
    import android.app.Activity;
    import android.view.Menu;
    import android.view.View;
    import android.widget.AdapterView;
    import android.widget.ArrayAdapter;
    import android.widget.Spinner;
    
    public class MainActivity extends Activity {
        private Spinner city=null;
        private  Spinner area=null;
    
        private  String[][] areaData = new String[][]{
                {"朝阳","海淀"},{"黄埔"},{"岳麓","雨花"}
    
        };
    
        //下拉列表内容Adapter
        private ArrayAdapter<CharSequence> adapterArea=null;
    
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            this.city=(Spinner)super.findViewById(R.id.city);
            this.area= (Spinner)super.findViewById(R.id.area);
            this.city.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                @Override
                public void onItemSelected(AdapterView<?> adapterView, View view, int idx, long id) {//选项选中时触发
                   //实例化列表项
                    MainActivity.this.adapterArea= new ArrayAdapter<CharSequence>(MainActivity.this,android.R.layout.select_dialog_item,MainActivity.this.areaData[idx]);
                   //设置列表显示风格
                    MainActivity.this.adapterArea.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                   //设置数据
                    MainActivity.this.area.setAdapter(MainActivity.this.adapterArea);
                }
    
                @Override
                public void onNothingSelected(AdapterView<?> adapterView) {
    
                }
            });
        }
    
    
        @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;
        }
        
    }
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  • 原文地址:https://www.cnblogs.com/alamps/p/5247800.html
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