下拉列表 Spinner。
Spinner的使用,可以极大提高用户的体验性。当需要用户选择的时候,可以提供一个下拉列表将所有可选的项列出来。供用户选择。
Demo如下,可以留作参考
一、使用数组作为数据源
1.新建一个android的工程
2.工程的layout.xml文件如下:声明一个TextView控件和一个Spinner控件
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout
- xmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:orientation="vertical"
- >
- <TextView android:id="@+id/spinnerText"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"></TextView>
- <Spinner android:id="@+id/Spinner01"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"></Spinner>
- </LinearLayout>
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <TextView android:id="@+id/spinnerText" android:layout_width="fill_parent" android:layout_height="wrap_content"></TextView> <Spinner android:id="@+id/Spinner01" android:layout_width="fill_parent" android:layout_height="wrap_content"></Spinner> </LinearLayout>
3.java代码
- import android.app.Activity;
- 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.TextView;
- public class SpinnerActivity extends Activity {
- private static final String[] m={"A型","B型","O型","AB型","其他"};
- private TextView view ;
- private Spinner spinner;
- private ArrayAdapter<String> adapter;
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- // TODO Auto-generated method stub
- super.onCreate(savedInstanceState);
- setContentView(R.layout.spinner);
- view = (TextView) findViewById(R.id.spinnerText);
- spinner = (Spinner) findViewById(R.id.Spinner01);
- //将可选内容与ArrayAdapter连接起来
- adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,m);
- //设置下拉列表的风格
- adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
- //将adapter 添加到spinner中
- spinner.setAdapter(adapter);
- //添加事件Spinner事件监听
- spinner.setOnItemSelectedListener(new SpinnerSelectedListener());
- //设置默认值
- spinner.setVisibility(View.VISIBLE);
- }
- //使用数组形式操作
- class SpinnerSelectedListener implements OnItemSelectedListener{
- public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
- long arg3) {
- view.setText("你的血型是:"+m[arg2]);
- }
- public void onNothingSelected(AdapterView<?> arg0) {
- }
- }
- }
import android.app.Activity; 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.TextView; public class SpinnerActivity extends Activity { private static final String[] m={"A型","B型","O型","AB型","其他"}; private TextView view ; private Spinner spinner; private ArrayAdapter<String> adapter; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.spinner); view = (TextView) findViewById(R.id.spinnerText); spinner = (Spinner) findViewById(R.id.Spinner01); //将可选内容与ArrayAdapter连接起来 adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,m); //设置下拉列表的风格 adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); //将adapter 添加到spinner中 spinner.setAdapter(adapter); //添加事件Spinner事件监听 spinner.setOnItemSelectedListener(new SpinnerSelectedListener()); //设置默认值 spinner.setVisibility(View.VISIBLE); } //使用数组形式操作 class SpinnerSelectedListener implements OnItemSelectedListener{ public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) { view.setText("你的血型是:"+m[arg2]); } public void onNothingSelected(AdapterView<?> arg0) { } } }
4、运行效果如下:
二、使用XML作为数据源
1.新建一个android的工程
2.在values文件夹下新建一个arryas.xml文件:声明一个TextView控件和一个Spinner控件,代码如下:
- <?xml version="1.0" encoding="utf-8"?>
- <resources>
- <string-array name="plantes">
- <item>NOKIA</item>
- <item>MOTO</item>
- <item>HTC</item>
- <item>LG</item>
- <item>其他</item>
- </string-array>
- </resources>
<?xml version="1.0" encoding="utf-8"?> <resources> <string-array name="plantes"> <item>NOKIA</item> <item>MOTO</item> <item>HTC</item> <item>LG</item> <item>其他</item> </string-array> </resources>
3.java代码
- import android.app.Activity;
- 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.TextView;
- public class SpinnerActivity extends Activity {
- private TextView view2;
- private Spinner spinner2;
- private ArrayAdapter adapter2;
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- // TODO Auto-generated method stub
- super.onCreate(savedInstanceState);
- setContentView(R.layout.spinner);
- spinner2 = (Spinner) findViewById(R.id.spinner02);
- view2 = (TextView) findViewById(R.id.spinnerText02);
- //将可选内容与ArrayAdapter连接起来
- adapter2 = ArrayAdapter.createFromResource(this, R.array.plantes, android.R.layout.simple_spinner_item);
- //设置下拉列表的风格
- adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
- //将adapter2 添加到spinner中
- spinner2.setAdapter(adapter2);
- //添加事件Spinner事件监听
- spinner2.setOnItemSelectedListener(new SpinnerXMLSelectedListener());
- //设置默认值
- spinner2.setVisibility(View.VISIBLE);
- }
- //使用XML形式操作
- class SpinnerXMLSelectedListener implements OnItemSelectedListener{
- public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
- long arg3) {
- view2.setText("你使用什么样的手机:"+adapter2.getItem(arg2));
- }
- public void onNothingSelected(AdapterView<?> arg0) {
- }
- }
- }
import android.app.Activity; 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.TextView; public class SpinnerActivity extends Activity { private TextView view2; private Spinner spinner2; private ArrayAdapter adapter2; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.spinner); spinner2 = (Spinner) findViewById(R.id.spinner02); view2 = (TextView) findViewById(R.id.spinnerText02); //将可选内容与ArrayAdapter连接起来 adapter2 = ArrayAdapter.createFromResource(this, R.array.plantes, android.R.layout.simple_spinner_item); //设置下拉列表的风格 adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); //将adapter2 添加到spinner中 spinner2.setAdapter(adapter2); //添加事件Spinner事件监听 spinner2.setOnItemSelectedListener(new SpinnerXMLSelectedListener()); //设置默认值 spinner2.setVisibility(View.VISIBLE); } //使用XML形式操作 class SpinnerXMLSelectedListener implements OnItemSelectedListener{ public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) { view2.setText("你使用什么样的手机:"+adapter2.getItem(arg2)); } public void onNothingSelected(AdapterView<?> arg0) { } } }
4、运行效果如下: