CustomDialog.java

package com.yamin.reader.view;

import android.app.Dialog;
import android.content.Context;
import android.content.res.Resources;
import android.util.DisplayMetrics;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
/**
 * 
* @ClassName: CustomDialog 
* @Description:自定义DIALOg
* @author ymcao
* @date 2013-6-23 下午2:14:01 
*
 */
public class CustomDialog extends Dialog {
	 private static int default_width = ViewGroup.LayoutParams.WRAP_CONTENT;; //默认宽度
     private static int default_height =ViewGroup.LayoutParams.WRAP_CONTENT;//默认高度
     public CustomDialog(Context context, View layout, int style) { 
         this(context, default_width, default_height, layout, style); 
     }
     public CustomDialog(Context context, int width, int height, View layout, int style) {
         super(context, style);
         //set content
        setContentView(layout);
         //set window params
         Window window = getWindow();
         WindowManager.LayoutParams params = window.getAttributes();
         //set width,height by density and gravity
         float density = getDensity(context);
         params.width = (int) (width*density);
         params.height = (int) (height*density);
         params.gravity = Gravity.CENTER;
         window.setAttributes(params);
     }
     private float getDensity(Context context) {
         Resources resources = context.getResources();
         DisplayMetrics dm = resources.getDisplayMetrics();
        return dm.density;
     }
     
}