Android基础----Spanner（下拉列表）

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Spanner（下拉列表）

实现：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"    tools:context="${relativePackage}.${activityClass}" >    <Spinner        android:id="@+id/shengfen"        android:layout_width="0dp"        android:layout_height="wrap_content"        android:layout_weight="1" >    </Spinner>    <Spinner        android:id="@+id/chengshi"        android:layout_width="0dp"        android:layout_height="wrap_content"        android:layout_weight="1" >    </Spinner>    <Spinner        android:id="@+id/quxian"        android:layout_width="0dp"        android:layout_height="wrap_content"        android:layout_weight="1" >    </Spinner></LinearLayout>

package com.example.jilian_spanner;import android.app.Activity;import android.content.Context;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.Toast;public class MainActivity extends Activity {private Context context = MainActivity.this;private Spinner shengfen_sn, chengshi_sn, quxian_sn;ArrayAdapter<String> s1, s2, s3;private String[] shengfen = { "江西省", "江苏省" };private String[][] chengshi = { { "南昌" }, { "南京" } };private String[][][] quxian = { { { "红谷滩", "青山湖区" } }, { { "苏子湖", "秦淮区" } } };private int shengfenposition;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);shengfen_sn = (Spinner) findViewById(R.id.shengfen);chengshi_sn = (Spinner) findViewById(R.id.chengshi);quxian_sn = (Spinner) findViewById(R.id.quxian);s1 = new ArrayAdapter<String>(this,android.R.layout.simple_expandable_list_item_1, shengfen);s2 = new ArrayAdapter<String>(this,android.R.layout.simple_expandable_list_item_1, chengshi[0]);s3 = new ArrayAdapter<String>(this,android.R.layout.simple_expandable_list_item_1, quxian[0][0]);shengfen_sn.setOnItemSelectedListener(new OnItemSelectedListener() {@Overridepublic void onItemSelected(AdapterView<?> parent, View view,int position, long id) {// TODO Auto-generated method stubs2 = new ArrayAdapter<String>(context,android.R.layout.simple_expandable_list_item_1,chengshi[position]);shengfenposition = position;chengshi_sn.setAdapter(s2);}@Overridepublic void onNothingSelected(AdapterView<?> parent) {// TODO Auto-generated method stub}});chengshi_sn.setOnItemSelectedListener(new OnItemSelectedListener() {@Overridepublic void onItemSelected(AdapterView<?> parent, View view,int position, long id) {// TODO Auto-generated method stubs3 = new ArrayAdapter<String>(context,android.R.layout.simple_expandable_list_item_1,quxian[shengfenposition][position]);quxian_sn.setAdapter(s3);}@Overridepublic void onNothingSelected(AdapterView<?> parent) {// TODO Auto-generated method stub}});shengfen_sn.setAdapter(s1);chengshi_sn.setAdapter(s2);quxian_sn.setAdapter(s3);}public void zhengxiang(View v) {// TODO Auto-generated method stubToast.makeText(context, "赖队吊炸天！！！！！！", Toast.LENGTH_LONG).show();}}

简单点的就是：

主函数入口：

package com.example.xialaliebiao;import android.app.Activity;import com.example.xialaliebiao.R;import android.os.Bundle;import android.widget.ArrayAdapter;import android.widget.Spinner;public class MainActivity extends Activity {    private Spinner Spinner;    private String[] menu = { "南昌", "上海", "广州" };    private ArrayAdapter<String> ArrayAdapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Spinner = (android.widget.Spinner) findViewById(R.id.spinner);        ArrayAdapter = new ArrayAdapter<String>(this,                android.R.layout.simple_expandable_list_item_1, menu);        Spinner.setAdapter(ArrayAdapter);    }}

布局：

<RelativeLayout 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"    tools:context="${relativePackage}.${activityClass}" >    <Spinner        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:dropDownWidth="match_parent"        android:id="@+id/spinner"        /></RelativeLayout>

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