android自定义Dialog如何控制View显示位置

重写Dialog，设置Dialog的contentView，如何设置contentView的现实位置，例子如下，设置ContentView底部显示

WindowManager.LayoutParams lp = new WindowManager.LayoutParams(); Window window = getWindow(); lp.copyFrom(window.getAttributes()); lp.width = WindowManager.LayoutParams.MATCH_PARENT; lp.height = WindowManager.LayoutParams.WRAP_CONTENT; lp.gravity = Gravity.BOTTOM; window.setAttributes(lp);