对话框 PopupWindow 相关

1.自定义Dialog 弹出

    noCardDialog=new NoCardDialog(context);  
                            Window noCardDialogWindow=noCardDialog.getWindow();  
                            WindowManager.LayoutParams lp=noCardDialogWindow.getAttributes();  
                            noCardDialogWindow.setGravity(Gravity.CENTER);  
                            lp.width=300;  
                            noCardDialogWindow.setAttributes(lp);  
                            noCardDialog.requestWindowFeature(Window.FEATURE_NO_TITLE);  
                            noCardDialog.show();  

    class NoCardDialog extends Dialog {  
      
           private ImageView iv1;  
           private ImageButton ib1;  
      
           public NoCardDialog(Context context) {  
               super(context);  
               // TODO Auto-generated constructor stub  
           }  
      
           @Override  
           protected void onCreate(Bundle savedInstanceState) {  
               super.onCreate(savedInstanceState);  
               this.setCancelable(false);// 设置点击屏幕Dialog不消失  
               setContentView(R.layout.nobindcard);  
               iv1= (ImageView) findViewById(R.id.nobindcard_iv1);  
               ib1= (ImageButton) findViewById(R.id.nobindcard_ib1);  
      
               if(mark==1){  
                   iv1.setImageResource(R.mipmap.nobind_topup);  
               }else if(mark==2){  
                   iv1.setImageResource(R.mipmap.nobind_withdrawal);  
               }  
      
           }  
       }  

2.PopupWindow

    public class PopMenuView implements OnItemClickListener {  
      
        private Context context;  
        private PopupWindow popupWindow;  
        private ListView listView;  
        private OnPItemClickListener listener;  
        private LayoutInflater inflater;  
        private int thisPosition;  
      
        private Handler handler = new Handler(Looper.getMainLooper()){  
      
            @Override  
            public void handleMessage(Message msg) {  
                // TODO Auto-generated method stub  
                super.handleMessage(msg);  
                switch (msg.what) {  
                case 0:  
                    if(listener != null) listener.onItemClick(thisPosition);  
                    break;  
                case 1:  
                    if(listener != null) listener.onDialogDismiss();   
                    break;  
                default:  
                    break;  
                }  
            }  
        };  
          
        public PopMenuView(Context context) {  
            this.context = context;  
      
            inflater = (LayoutInflater) context  
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);  
            View view = (View) inflater.inflate(R.layout.searchpopmenu, null);  
      
            listView = (ListView) view.findViewById(R.id.searchpopmenu_listView);  
            listView.setAdapter(new PopMenuAdapter(context));  
            listView.setOnItemClickListener(this);  
      
            popupWindow = new PopupWindow(view, context.getResources()  
                    .getDimensionPixelSize(R.dimen.popmenu_width),  
                    LayoutParams.WRAP_CONTENT);  
            popupWindow.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));  
            popupWindow.setOnDismissListener(new OnDismissListener() {  
      
                @Override  
                public void onDismiss() {  
                    // TODO Auto-generated method stub  
                    handler.sendEmptyMessage(1);  
                }  
            });  
        };  
      
        @Override  
        public void onItemClick(AdapterView<?> parent, View view, int position,  
                long id) {  
            thisPosition = position;  
            handler.sendEmptyMessage(0);  
            dismiss();  
        }  
      
        public void setOnItemClickListener(OnPItemClickListener listener) {  
            this.listener = listener;  
        }  
      
        public void showAsDropDown(View parent) {  
      
            popupWindow.showAsDropDown(parent, -10, context.getResources()  
                    .getDimensionPixelSize(R.dimen.popmenu_yoff));  
            popupWindow.setFocusable(true);  
            popupWindow.setOutsideTouchable(true);  
            popupWindow.update();  
        }  
      
        public void dismiss() {  
            if (popupWindow.isShowing())  
                popupWindow.dismiss();  
        }  
      
        public interface OnPItemClickListener {  
            public void onItemClick(int index);  
      
            public void onDialogDismiss();  
        }  
    }  

3.设置背景为透明的方法

把PopWindow自定义的layout背景色设置为透明的颜色  
<solid android:color="#80000000"/>  
前两位为透明度 

4.7种形式的Android Dialog使用举例

http://www.oschina.net/question/54100_32486

5.Service中弹出Dialog对话框，即全局性对话框

先说具体做法，原因在其后给出：
写好Alter功能块后，在alter.show()语句前加入：
alert.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT); 
注：alter为AlertDialog类型对象
然后在AndroidManifest.xml中加入权限：
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"></uses-permission>  

下面进行简单的解释：
如果只在Service中写入常在Activity中使用的创建Alter的代码，运行时是会发生错误的，因为Alter的显示需要依附于一个确定的Activity类。
而以上做法就是声明我们要弹出的这个提示框是一个系统的提示框，即全局性质的提示框，
所以只要手机处于开机状态，无论它现在处于何种界面之下，只要调用alter.show()，就会弹出提示框来