Spinner下拉菜单控件

最新推荐文章于 2024-12-23 14:28:50 发布

原创最新推荐文章于 2024-12-23 14:28:50 发布 · 154 阅读

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CC 4.0 BY-SA版权

本文介绍如何在Android应用中实现下拉菜单功能，包括静态和动态生成下拉选项的方法，并展示了具体的代码实例。

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简单下拉菜单:

SpinnerActivity


package com.cn;

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.Toast;

public class SpinnerActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        Spinner spinner = (Spinner) findViewById(R.id.spinner1);
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
                this, R.array.spinnerList, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(adapter);
        
        spinner.setOnItemSelectedListener(new MyOnItemSelectedListener());
    }
    
    public class MyOnItemSelectedListener implements OnItemSelectedListener {

        public void onItemSelected(AdapterView<?> parent,
            View view, int pos, long id) {
        	Toast.makeText(parent.getContext(), "The planet is " +
        		parent.getItemAtPosition(pos).toString(), Toast.LENGTH_LONG).show();
        }

        public void onNothingSelected(AdapterView parent) {
          // Do nothing.
        }
    }
}

strings.xml


<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, SpinnerActivity!</string>
    <string name="app_name">Spinner</string>
    <string-array name="spinnerList">
        <item>test1</item>
        <item>test2</item>
    </string-array>
</resources>

main.xml


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<Spinner android:layout_height="wrap_content" android:layout_width="match_parent" android:id="@+id/spinner1"></Spinner>
</LinearLayout>

动态生成下拉框数据, 不定义样式
转载: http://imshare.iteye.com/blog/770950

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.效果图

如果需要动态生成下拉框数据.则
需要对ArrayAdapter做另外一种生成, 并且需要编写一个xml对每行的样式进行定义

SpinnerActivity.java


package com.cn;

import java.util.ArrayList;
import java.util.List;

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.Toast;

public class SpinnerActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        Spinner spinner = (Spinner) findViewById(R.id.spinner1);
       /* ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
                this, R.array.spinnerList, android.R.layout.simple_spinner_item);*/
        List<String> list = new ArrayList<String>();
        list.add("test3");
        list.add("test4");
        ArrayAdapter adapter = new ArrayAdapter(this, R.layout.item, R.id.textView1, list);
        
//        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(adapter);
        
        spinner.setOnItemSelectedListener(new MyOnItemSelectedListener());
    }
    
    public class MyOnItemSelectedListener implements OnItemSelectedListener {

        public void onItemSelected(AdapterView<?> parent,
            View view, int pos, long id) {
        	Toast.makeText(parent.getContext(), "The planet is " +
        		parent.getItemAtPosition(pos).toString(), Toast.LENGTH_LONG).show();
        }

        public void onNothingSelected(AdapterView parent) {
          // Do nothing.
        }
    }
}

item.xml


<?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:id="@+id/textView1" android:layout_width="match_parent" android:text="TextView" android:layout_height="wrap_content"></TextView>
   
    
</LinearLayout>