Android PopupWindow

package com.android.tian; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.view.Gravity; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.PopupWindow; public class MainActivity extends Activity { /** Called when the activity is first created. */ Button mShowBtn; Button mNameBtn; Button mCancelBtn; EditText mNameEdit; View vPopupWindowView; LayoutInflater inflater; PopupWindow mPopupWindow; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //获取控件 mShowBtn = (Button)findViewById(R.id.show_button); //响应按钮事件 mShowBtn.setOnClickListener(new ClickEvent()); } public void showPopWindow(Context context,View parent){ inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); vPopupWindowView = inflater.inflate(R.layout.popupwindow,null,false); mPopupWindow = new PopupWindow(vPopupWindowView,300,300,false); mCancelBtn = (Button)vPopupWindowView.findViewById(R.id.cancel_button); mNameEdit=(EditText)vPopupWindowView.findViewById(R.id.name_edit); mNameBtn = (Button)vPopupWindowView.findViewById(R.id.name_button); mNameBtn.setOnClickListener(new ClickEvent()); mCancelBtn.setOnClickListener(new ClickEvent()); /*mCancelBtn.setOnClickListener(new Button.OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-generated method stub mPopupWindow.dismiss(); } }); */ //mPopupWindow.showAtLocation(parent,Gravity.LEFT,0,0); mPopupWindow.showAsDropDown(parent); } //统一处理的按钮事件类 class ClickEvent implements OnClickListener { @Override public void onClick(View v) { // TODO Auto-generated method stub if((Button)v==mShowBtn){ showPopWindow(MainActivity.this,MainActivity.this.findViewById(R.id.show_button)); }else if((Button)v==mNameBtn){ mNameEdit.setText("What"); }else if((Button)v==mCancelBtn){ mPopupWindow.dismiss(); } } } }