PopupUtil.java

package com.jarrah.photo;

import android.app.Dialog;
import android.content.Context;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.WindowManager.LayoutParams;

/**
 * 需要在style里面添加这些xml
  <style name="XDialog" parent="@android:style/Theme.Dialog">
        <item name="android:windowBackground">@android:color/transparent</item>
        <item name="android:windowFrame">@null</item>
        <item name="android:windowNoTitle">true</item>
        <item name="android:windowIsFloating">true</item>
        <item name="android:windowIsTranslucent">true</item>
        <item name="android:windowAnimationStyle">@style/DialogAnimation</item>
        <item name="android:background">@android:color/transparent</item>
        <item name="android:backgroundDimEnabled">true</item>
        <item name="android:windowFullscreen">true</item>
    </style>

    <style name="DialogAnimation" parent="@android:style/Animation.Dialog">
        <item name="android:windowEnterAnimation">@anim/push_up_in</item>
        <item name="android:windowExitAnimation">@anim/push_down_out</item>
    </style>
*/

//需要添加这些动画
//push_down_out
//<?xml version="1.0" encoding="utf-8"?>
//<set xmlns:android="http://schemas.android.com/apk/res/android" >
//
//    <translate
//        android:duration="300"
//        android:fromYDelta="0.0"
//        android:toYDelta="100.0%p" />
//
//</set>

//push_up_in
//<?xml version="1.0" encoding="utf-8"?>
//<set xmlns:android="http://schemas.android.com/apk/res/android" >
//
//    <translate
//        android:duration="300"
//        android:fromYDelta="100.0%p"
//        android:toYDelta="0.0" />
//
//</set>



public class PopupUtil {

	public static final int WIDTH = 0;
	public static final int HEIGHT = 1;

	public static boolean showDialog(Dialog dialog) {

		if (dialog == null) {
			log("dialog is null");
			return false;
		}

		if (dialog.isShowing()) {
			log("dialog is showing");
			return false;
		}

		dialog.show();
		return true;
	}

	/**
	 * create a popup menu 
	 * @param context
	 * @param contentView
	 * @return
	 */
	public static Dialog makePopup(Context context, View contentView) {
		Dialog dialog = new Dialog(context, R.style.popupDialog);
		Window window = dialog.getWindow();
		WindowManager.LayoutParams windowParams = new WindowManager.LayoutParams();
		int[] size = getScreenSize(context);
		windowParams.x = 0;
		windowParams.y = size[HEIGHT];

		//设置window的布局参数
		window.setAttributes(windowParams);
		// window.setBackgroundDrawableResource(R.drawable.alert_dialog_background);
		dialog.setCanceledOnTouchOutside(true);
		dialog.setContentView(contentView);
		// 显示的大小是contentView 的大小
		dialog.getWindow().setLayout(LayoutParams.MATCH_PARENT,
				LayoutParams.WRAP_CONTENT);
		return dialog;
	}

	/**
	 * get device size
	 * @param context
	 * @return 
	 */
	public static int[] getScreenSize(Context context) {
	    int[] deviceSize = new int[2];
	    int w = 0;
	    int h = 0;
	    DisplayMetrics dm = new DisplayMetrics();
	    WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
	    wm.getDefaultDisplay().getMetrics(dm);
	    w = dm.widthPixels;
	    h = dm.heightPixels;
	    deviceSize[WIDTH] = w;
	    deviceSize[HEIGHT] = h;
	    return deviceSize;
	}
	
	public static void log(String msg) {
		Log.e("dialog", msg);
	}
}