Android 之 下拉框(Spinner)的使用-转

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>

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) {
        }
    }
}

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>

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) {

        }

    }
}

4、运行效果如下： 

 

 

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