Android 自定义Dialog

    public class CouponDialog extends Dialog {

        private Item item;
        private Context mContext;
        private FragmentActivity activity;
        private Dialog dialog;

        private ImageButton close;
        private Button getCoupon, buy;
        private TextView couponTitle, buyTitle, couponValue, couponText, itemTitle, itemPrice;
        private ImageView itemImg;
        private LinearLayout itemBuy, couponGet;

        public CouponDialog(Context context) {
            super(context);
            this.mContext = context;
        }

        public CouponDialog(Context context, int theme) {
            super(context, theme);
            this.mContext = context;
        }

        public CouponDialog(FragmentActivity activity, Item item) {
            super(activity);

            this.item = item;
            this.activity = activity;

            initDialog();
        }

        private void initDialog() {
            
            //dialog样式属性
            dialog= new Dialog(getContext(), R.style.sale_coupon_dialog);

            Window dialogWindow = dialog.getWindow();
            WindowManager.LayoutParams lp = dialogWindow.getAttributes();
            lp.width = LinearLayout.LayoutParams.WRAP_CONTENT;
            lp.height = LinearLayout.LayoutParams.WRAP_CONTENT;
            
            //dialogWindow.setGravity(Gravity.BOTTOM);    //显示在底部
            
            dialogWindow.setAttributes(lp);
            
            //dialog布局
            View view = LayoutInflater.from(getContext()).inflate(R.layout.sale_cell_group_dialog, null);

            close = (ImageButton) view.findViewById(R.id.ib_close);
            close.setOnClickListener(clickListener);
            getCoupon = (Button) view.findViewById(R.id.btn_get_coupon);
            getCoupon.setOnClickListener(clickListener);
            buy = (Button) view.findViewById(R.id.btn_item_buy);
            buy.setOnClickListener(clickListener);
            couponGet = (LinearLayout) view.findViewById(R.id.ll_get_coupon);
            couponGet.setOnClickListener(clickListener);
            itemBuy = (LinearLayout) view.findViewById(R.id.ll_item_buy);
            itemBuy.setOnClickListener(clickListener);

            couponTitle = (TextView) view.findViewById(R.id.tv_coupon_title);
            couponText = (TextView) view.findViewById(R.id.tv_coupon_text);
            buyTitle = (TextView) view.findViewById(R.id.tv_buy_title);
            couponValue = (TextView) view.findViewById(R.id.tv_coupon_value);
            itemTitle = (TextView) view.findViewById(R.id.tv_item_title);
            itemPrice = (TextView) view.findViewById(R.id.tv_item_price);
            itemImg = (ImageView) view.findViewById(R.id.iv_item_image);

            couponText.setText("到" + item.getMerchant_name() + "抢优惠券");
            buyTitle.setText("到" + item.getMerchant_name() + "购买商品");

            if (item.getItem_coupon_value() != null && !"".equals(item.getItem_coupon_value())) {
                couponValue.setText(item.getItem_coupon_value() + "元");
            }
            else {
                couponValue.setText("未知");
            }

            if (item.getItem_coupon_title() != null && !"".equals(item.getItem_coupon_title())) {
                couponTitle.setText(item.getItem_coupon_title());
            }
            else {
                couponTitle.setText("优惠券");
            }

            itemTitle.setText(item.getItem_title());
            itemPrice.setText((item.getItem_price_string()==null?"0.00":item.getItem_price_string())+" ");

            FLDImageLoaderUtil.displayImage(FLDImageFitUtil.fitImage(getContext(), item.getItem_image(), AppUtil.dip2px(activity, 80), AppUtil.dip2px(activity, 80)), itemImg, R.mipmap.placeholder_square);

            dialog.setContentView(view);
            dialog.show();

        }

        private View.OnClickListener clickListener = new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                switch (v.getId()) {
                    case R.id.ib_close:
                        if (dialog != null && dialog.isShowing()) {
                            Log.i("close dialog", "dismiss");
                            dialog.dismiss();
                        }
                        break;
                    case R.id.btn_get_coupon:
                        Intent coupon = new Intent(activity, WebActivity.class);
                        coupon.putExtra("loadUrl", item.getItem_coupon_url());
                        coupon.putExtra("modal", 1);
                        activity.startActivity(coupon);
                        break;
                    case R.id.btn_item_buy:
                        Intent buy = new Intent(activity, WebActivity.class);
                        buy.putExtra("loadUrl", item.getItem_redirect_url());
                        activity.startActivity(buy);
                        dialog.dismiss();
                        break;
                    case R.id.ll_get_coupon:
                        Intent intent = new Intent(activity, WebActivity.class);
                        intent.putExtra("loadUrl", item.getItem_coupon_url());
                        intent.putExtra("modal", 1);
                        activity.startActivity(intent);
                        break;
                    case R.id.ll_item_buy:
                        Intent buyIntent = new Intent(activity, WebActivity.class);
                        buyIntent.putExtra("loadUrl", item.getItem_redirect_url());
                        activity.startActivity(buyIntent);
                        dialog.dismiss();
                        break;
                }
            }
        };

    }
    
    //dialog属性样式
    <style name="dialog_tran" parent="android:style/Theme.Dialog">
        <item name="android:windowFrame">@null</item>   <!-- 边框 -->
        <item name="android:windowNoTitle">true</item>  <!-- 没有标题 -->
        <item name="android:windowBackground">@android:color/transparent</item>                 <!-- 对话框的内容窗口背景色 -->
        <item name="android:windowIsFloating">false</item>  <!-- 是否浮现在activity之上 -->
        <item name="android:windowContentOverlay">@null</item>  <!-- 是否有覆盖 -->
        <item name="android:windowIsTranslucent">true</item>    <!-- 背景透明 -->
        <item name="android:backgroundDimEnabled">false</item>  //背景变暗
        <item name="android:backgroundDimAmount">0.6</item>                 <!-- 整个屏幕背景的灰度值 -->
    </style>

    <style name="sale_coupon_dialog" parent="dialog_tran">
        //dialog背景
        <item name="android:windowBackground">@drawable/shape_sale_coupondialog_background</item>
        <item name="android:backgroundDimEnabled">true</item>   //背景变暗
        <item name="android:windowIsTranslucent">false</item>   //半透明
    </style>