Android04--Android之下拉列表Spinner

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实现下拉列表的属性Spinner

1.首先来在XML中显示一个Spinner

// xml中 <Spinner        android:id="@+id/spinner"        android:layout_centerInParent="true"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:popupBackground="#99c613"        android:entries="@array/test_data"/>

// strings资源文件中 <string-array name="test_data">        <item>Test01</item>        <item>Test02</item>        <item>Test03</item>        <item>Test04</item>        <item>Test05</item>        <item>Test06</item>    </string-array>

2.ArrayAdapter

1.ArrayAdapter适配器,查看他的参数可以知道展示的均是一种文本的形式.
2. 往数据源中添加一条数据,一般的做法是:

//        // view绝对不直接操作适配源,不推荐,违背了MVC模式,M和V直接交互//        list.add("小妹妹");//        // 通知是刷新适配器//        adapter.notifyDataSetChanged();// 目前推荐的做法:直接往适配器中添加数据.adapter.add("小妹妹");

3.下拉列表框

// 主布局<?xml version="1.0" encoding="utf-8"?><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"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.jash.spinnerdemo.MainActivity">    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_centerInParent="true"        android:orientation="horizontal">        <Spinner            android:layout_width="0dp"            android:layout_weight="1"            android:layout_height="wrap_content"            android:background="#f00"            android:id="@+id/main_spinner"/>        <Spinner            android:layout_width="0dp"            android:layout_weight="1"            android:layout_height="wrap_content"            android:background="#ff0"            android:id="@+id/main_spinner_1"/>        <Spinner            android:layout_width="0dp"            android:layout_weight="1"            android:layout_height="wrap_content"            android:background="#0f0"            android:id="@+id/main_spinner_2"/>    </LinearLayout></RelativeLayout>

// 加到Spinner上的布局<?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:layout_width="wrap_content"        android:layout_height="wrap_content"        android:textSize="30sp"        android:textColor="#000"        android:text="数据"/>    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:textSize="30sp"        android:textColor="#00f"        android:id="@+id/item_text"/></LinearLayout>

// MainActivitypackage com.jash.spinnerdemo;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.ArrayAdapter;import android.widget.Spinner;import android.widget.Toast;import java.util.ArrayList;import java.util.Arrays;public class MainActivity extends AppCompatActivity  implements AdapterView.OnItemSelectedListener {    private ArrayAdapter<String> adapter;    private ArrayAdapter<String> adapter_1;    private ArrayAdapter<String> adapter_2;    private static final String[] PROVINCES = {"北京", "河北", "河南"};    private static final String[][] CITIES = {{"北京"}, {"石家庄", "邯郸", "衡水", "张家口"}, {"郑州", "洛阳", "商丘", "周口"}};    private static final String[][][] AREAS = {{{"海淀","昌平","朝阳", "东城", "西城"}}, {{"A", "B"}, {"C","D"}, {}, {}}, {{}, {}, {}, {}}};    private Spinner spinner;    private Spinner spinner_1;    private Spinner spinner_2;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        spinner = (Spinner) findViewById(R.id.main_spinner);        spinner_1 = (Spinner) findViewById(R.id.main_spinner_1);        spinner_2 = (Spinner) findViewById(R.id.main_spinner_2);        adapter = new ArrayAdapter<>(this, R.layout.spinner_child, R.id.item_text, new ArrayList<>(Arrays.asList(PROVINCES)));        adapter_1 = new ArrayAdapter<>(this, R.layout.spinner_child, R.id.item_text, new ArrayList<>(Arrays.asList(CITIES[0])));        adapter_2 = new ArrayAdapter<>(this, R.layout.spinner_child, R.id.item_text, new ArrayList<>(Arrays.asList(AREAS[0][0])));        spinner.setAdapter(adapter);        spinner_1.setAdapter(adapter_1);        spinner_2.setAdapter(adapter_2);        spinner.setOnItemSelectedListener(this);        spinner_1.setOnItemSelectedListener(this);        spinner_2.setOnItemSelectedListener(this);    }    @Override    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {        Toast.makeText(MainActivity.this,PROVINCES[position], Toast.LENGTH_SHORT).show();        Toast.makeText(MainActivity.this,String.valueOf(position) , Toast.LENGTH_SHORT).show();        switch (parent.getId()) {            case R.id.main_spinner:                adapter_1.clear();                adapter_1.addAll(CITIES[position]);                adapter_2.clear();                adapter_2.addAll(AREAS[position][0]);                if (adapter_2.isEmpty()) {               // GONE设置为不见之后,不会占位,INVISIBLE会占位                    spinner_2.setVisibility(View.GONE);                } else {                    spinner_2.setVisibility(View.VISIBLE);                }                break;            case R.id.main_spinner_1:                adapter_2.clear();                adapter_2.addAll(AREAS[spinner.getSelectedItemPosition()][position]);                if (adapter_2.isEmpty()) {                    spinner_2.setVisibility(View.GONE);                } else {                    spinner_2.setVisibility(View.VISIBLE);                }                break;            case R.id.main_spinner_2:                break;        }    }    @Override    public void onNothingSelected(AdapterView<?> parent) {    }}

效果:

这里写图片描述

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