android 对话框弹出位置和透明度的设置

此文转载，出处

AlertDialog dialog = new AlertDialog.Builder(DeviceListActivity.this)
    .setTitle("title")
    .setMessage("message").create();
Window window = dialog.getWindow();
window.setGravity(Gravity.TOP); // Gravity.BOTTOM

WindowManager.LayoutParams lp = window.getAttributes();
// 设置透明度为0.3

lp.alpha = 0.6f;
window.setAttributes(lp);
dialog.show();