(1)首先在res文件夾下面的values中創建一個省市arrays.xml文件夾,如下
<?xml version="1.0" encoding="utf-8"?> <resources> <string-array name="province"> <item>-省份-</item> <item>河北省</item> <item>山西省</item> <item>北京市</item> </string-array> <string-array name="hb"> <item>-城市-</item> <item>承德市</item> <item>邯鄲市</item> <item>廊坊市</item> </string-array> <string-array name="bj"> <item>-城市-</item> <item>海淀區</item> <item>朝陽區</item> <item>崇文區</item> </string-array> <string-array name="shx"> <item>-城市-</item> <item>大同市</item> <item>臨汾市</item> </string-array> </resources>
(2)然后再布局文件中添加兩個spinner控件,xml布局代碼如下
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/LinearLayout1" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" 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.example.spinner.MainActivity" > <Spinner android:id="@+id/spPro" android:layout_width="match_parent" android:layout_height="wrap_content" /> <Spinner android:id="@+id/spcity" android:layout_width="match_parent" android:layout_height="wrap_content" /> </LinearLayout>
(3)到這里資源和布局界面已經搭好,接下來就是在MainActivity中用代碼來控制省市的聯動,詳解在代碼的注釋中,代碼如下
public class MainActivity extends Activity { private Spinner spPro, spCity; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); spPro = (Spinner) findViewById(R.id.spPro); spCity = (Spinner) findViewById(R.id.spcity); // 設置數據源 ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.province, android.R.layout.simple_spinner_item); // 設置下拉列表的風格 adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); // 綁定數據源到spinner控件上 spPro.setAdapter(adapter); //spinner選項選擇事件 spPro.setOnItemSelectedListener(new OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { //此處的parent是指的spPro的下拉框 Spinner spinner = (Spinner) parent; //通過getItemAtPosition(position)的方法來找到省項的名稱 String pro = (String) spinner.getItemAtPosition(position); //設置市級的數據適配器 ArrayAdapter<CharSequence> cityAdapter = ArrayAdapter.createFromResource(MainActivity.this, R.array.bj, android.R.layout.simple_spinner_item); //判斷,然后設置適配器 if (pro.equals("河北省")) { cityAdapter = ArrayAdapter.createFromResource(MainActivity.this, R.array.hb, android.R.layout.simple_spinner_item); } else if (pro.equals("北京市")) { cityAdapter = ArrayAdapter.createFromResource(MainActivity.this, R.array.bj, android.R.layout.simple_spinner_item); } else if (pro.equals("山西省")) { cityAdapter = ArrayAdapter.createFromResource(MainActivity.this, R.array.shx, android.R.layout.simple_spinner_item); } spCity.setAdapter(cityAdapter); } @Override public void onNothingSelected(AdapterView<?> parent) { } }); } }
最后運行的效果就是如下圖所示