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;

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)

< xml version="1.0" encoding="utf-8" >

厦门
北京
上海