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[操作系统]andriod Spinner


<??>  <LinearLayout android:orientation="vertical" android:layout_height="fill_parent" android:layout_width="fill_parent" ="http://schemas.android.com/apk/res/android">  <TextView android:layout_height="wrap_content" android:layout_width="fill_parent" android:text="下拉框1:" android:id="@+id/label"/>  <Spinner android:layout_height="wrap_content" android:layout_width="150dip" android:id="@+id/spinner1" android:drawSelectorOnTop="false"/>  <TextView android:layout_height="wrap_content" android:layout_width="fill_parent" android:text="下拉框2:" android:id="@+id/label"/>  <Spinner android:layout_height="wrap_content" android:layout_width="150dip" android:id="@+id/spinner2" android:drawSelectorOnTop="false"/>  <Button android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="@string/ok" android:id="@+id/ok"/></LinearLayout>

package com.example.yanlei.mytk;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.AdapterView;import android.widget.ArrayAdapter;import android.widget.Button;import android.widget.Spinner;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {  private Spinner spinner1;  private Spinner spinner2;  private Button ok;  private ArrayAdapter countiesAdapter;  private String[] mCounties = {"beijing", "guangdong", "guangxi", "hunan"};  private List<String> allCounties = new ArrayList<String>();  private String result = "你选择的是:";  @Override  protected void onCreate(Bundle savedInstanceState) {    // TODO Auto-generated method stub    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    spinner1 = (Spinner) findViewById(R.id.spinner1);    spinner2 = (Spinner) findViewById(R.id.spinner2);    ok = (Button) findViewById(R.id.ok);    for (int i = 0; i < mCounties.length; i++) {      allCounties.add(mCounties[i]);    }    countiesAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, allCounties);    countiesAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);    spinner1.setAdapter(countiesAdapter);    ArrayAdapter adapter = ArrayAdapter.createFromResource(this, R.array.counties, android.R.layout.simple_spinner_item);    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);    spinner2.setAdapter(adapter);    //单击第一个下拉按钮时,显示选择的值。    spinner1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {      @Override      public void onItemSelected(AdapterView<?> adapter, View view,                    int position, long id) {        // TODO Auto-generated method stub        String str = (String) spinner1.getAdapter().getItem((int) id);        setTitle(result + str);      }      @Override      public void onNothingSelected(AdapterView<?> arg0) {        // TODO Auto-generated method stub      }    });    //单击第二个下拉按钮时,显示选择的值。    spinner2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {      @Override      public void onItemSelected(AdapterView<?> adapter, View view,                    int position, long id) {        String str = (String) spinner2.getAdapter().getItem(position);        setTitle(result + str);      }      @Override      public void onNothingSelected(AdapterView<?> arg0) {      }    });    //单击确定按钮,提取选择的值.    ok.setOnClickListener(new View.OnClickListener() {      @Override      public void onClick(View v) {        setTitle(result + spinner1.getSelectedItem() + " - >> " + spinner2.getSelectedItem());      }    });  }}

arrays.

<??><resources>  <string-array name="counties">    <item>AAA</item>    <item>BBB</item>    <item>CCC</item>    <item>DDD</item>    <item>EEE</item>  </string-array></resources>