dialog width match parent

gistfile1.java

   void show() {
        final Dialog dialog = new Dialog(this);
        final Window window = dialog.getWindow();
        window.requestFeature(Window.FEATURE_NO_TITLE);
        window.setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);

        // set content view must before set other attributes
        dialog.setContentView(R.layout.dialog_content);

        final WindowManager.LayoutParams lp = window.getAttributes();
        lp.width = WindowManager.LayoutParams.MATCH_PARENT;
        lp.height = WindowManager.LayoutParams.WRAP_CONTENT;
        lp.dimAmount = 0.3f;
        lp.flags |= WindowManager.LayoutParams.FLAG_DIM_BEHIND;
        lp.softInputMode |= WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE;
        lp.gravity = Gravity.BOTTOM;
        window.setAttributes(lp);
        dialog.getWindow().setBackgroundDrawable(null);

        dialog.show();
    }