方案一:加show监听,然后强制弹出即可 

AlertDialog dialog = new AlertDialog.Builder(context)
                .setView(customView)
                .setCancelable(isCancelable).create();
        dialog.setOnShowListener(new DialogInterface.OnShowListener() {
            @Override
            public void onShow(DialogInterface dialogInterface) {
                KeyboardUtils.showSoftInput(context);
            }
        });

方案二:设置点击事件,然后强制弹出

方案三:延时强制弹框