Android 之下拉框(Spinner)的简单使用

た入场券 2022-08-08 03:28 139阅读 0赞

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("你来自："+adapter2.getItem(arg2));     
            }     
        
            public void onNothingSelected(AdapterView<?> arg0) {     
                     
            }     
                 
        }     
    }

主要是：

setDropDownViewResource 主要是设置 User 点击 Spinner 后出现的下拉菜单样式， android 亦提供两种基本的样式：    
android.R.layout.simple\_spinner\_item ： TextView 的下拉菜单。    
android.R.layout.simple\_spinner\_dropdown\_item ：除了有 TextView ，右边有 radio 的下拉菜单。