弹窗常用AlertDialog来袜，因为AlertDialog可以很方便的添加所要的项。比如确定/取消按钮，自定义的标题栏、自定义的信息布局等。在自定义布局时，比如我们采用LinearLayout来布局，然后再往LinearLayout中添加一些项，比如TextView、EditText等。这些都很容易实现。

不过，如果添加spinner，可能就会出问题了。找了很久，发现是context引起的。因为spinner在点击展开下拉列表时，需要依赖于窗体，而使用context只是提供了一个上下文，并没有提供窗体，所以会造成错误。下面是已实现的代码：

package com.sparkle;import android.app.Activity;import android.app.AlertDialog;import android.app.AlertDialog.Builder;import android.app.Dialog;import android.content.Context;import android.content.DialogInterface;import android.graphics.Color;import android.util.Log;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.LinearLayout;import android.widget.Spinner;import android.widget.SpinnerAdapter;import android.widget.TextView;public class Contury {	private Activity _activity = null;	private Context _context = null;	private Spinner _spinner = null;	public Contury(Activity activity) {		_activity = activity;		_context = activity;			}	private LinearLayout GenerateLinearLayout(int orientation) {		LinearLayout linearLayout = new LinearLayout(_context);		linearLayout.setPadding(16, 16, 16, 16);		linearLayout.setOrientation(orientation);		return linearLayout;	}	@SuppressWarnings("deprecation")	private Spinner GenerateSpinner() {		Spinner spinner = new Spinner(_activity);		LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(				LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);		spinner.setLayoutParams(layoutParams);		return spinner;	}	public void Popup() {		Builder alertDialogBuilder = new AlertDialog.Builder(_activity);		View view = GenerateLayout();		alertDialogBuilder.setView(view);		alertDialogBuilder.setPositiveButton("OK",				new DialogInterface.OnClickListener() {					@Override					public void onClick(DialogInterface dialog, int which) {						Log.e("TEST","OK");					}				});		alertDialogBuilder.setNegativeButton("Cancel", null);		Dialog alertDialog = alertDialogBuilder.create();		alertDialog.show();	}	private View GenerateLayout() {		LinearLayout linearLayout = GenerateLinearLayout(LinearLayout.VERTICAL);		LinearLayout messageLinearLayout = GenerateMessageLayout();		linearLayout.addView(messageLinearLayout);		return linearLayout;	}	private LinearLayout GenerateMessageLayout() {		LinearLayout linearLayout = GenerateLinearLayout(LinearLayout.HORIZONTAL);		_spinner = GenerateSpinner();		_spinner.setAdapter(new CityAdapter(_activity));				_spinner.setSelection(0);		linearLayout.addView(_spinner);		return linearLayout;	}		private class CityAdapter extends BaseAdapter implements SpinnerAdapter {		private Context _con=null;		private String[] _cities=null;				public CityAdapter(Context context)		{			_con=context;			_cities=_con.getResources().getStringArray(					R.array.cities);		}		        @Override        public int getCount() {        	if(_cities==null)        	{        		return 0;        	}            return _cities.length;        }        @Override        public Object getItem(int position) {        	if(_cities==null||_cities.length<=0)        	{        		return null;        	}            return _cities[position];        }        @Override        public long getItemId(int position) {            return position;        }  		@Override		public View getView(int position, View convertView, ViewGroup parent) {			TextView textView=new TextView(_con);			textView.setTextColor(Color.BLACK);			textView.setTextSize(20);			textView.setText(_cities[position]);			return textView;		}		    }}

注：

1、spinner和AlertDialog的new需使用activity，使用context将在弹出下拉菜单时造成错误。

2、_con.getResources().getStringArray(R.array.cities)是加载xml中定义的数组。

city.xml(位于values文件夹下)

    
        
             
      
       厦门
              
      
       北京
              
      
       上海